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[PATCH 7/7] Make Append node async-aware.
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* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: text/plain
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
MIME-Version: 1.0


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: text/plain
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
MIME-Version: 1.0


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: text/plain
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
MIME-Version: 1.0


-- 
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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: text/plain
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
MIME-Version: 1.0


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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Content-Disposition: inline
Content-Transfer-Encoding: 8bit
MIME-Version: 1.0


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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Content-Transfer-Encoding: 7bit
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CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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Content-Disposition: inline
Content-Transfer-Encoding: 8bit
MIME-Version: 1.0


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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Content-Transfer-Encoding: 8bit
MIME-Version: 1.0


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 94 ++++++++++++++++++++++++++++++++-------
 src/include/nodes/execnodes.h     |  2 +
 2 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..1c0d26e 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,49 +199,104 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
-	for (;;)
+	int n_notready = 0;
+	PlanState  *subnode;
+	int i, n;
+
+	n = node->as_whichplan;
+
+	for (i = 0 ; i < node->as_nplans ; i++)
 	{
-		PlanState  *subnode;
 		TupleTableSlot *result;
 
+		if (node->as_async)
+		{
+			if (n >= node->as_nplans)
+				n = 0;
+
+			if (node->as_finished[n])
+			{
+				n++;
+				continue;
+			}
+		}
+
 		/*
 		 * figure out which subplan we are currently processing
 		 */
-		subnode = node->appendplans[node->as_whichplan];
+		subnode = node->appendplans[n];
 
 		/*
-		 * get a tuple from the subplan
+		 * execute the subplan to get a result if it is not ready yet
 		 */
-		result = ExecProcNode(subnode);
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		/*
+		 * This subnode is not ready yet when asynchrony is not allowed,
+		 * immediately wait for this subnode.
+		 */
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				n_notready++;
+				n++;
+				continue;
+			}
+			ExecAsyncWaitForNode(subnode);
+		}
+
+		Assert(subnode->result_ready);
+
+		result = ExecConsumeResult((PlanState *)subnode);
 
 		if (!TupIsNull(result))
 		{
 			/*
-			 * If the subplan gave us something then return it as-is. We do
-			 * NOT make use of the result slot that was set up in
-			 * ExecInitAppend; there's no need for it.
+			 * If the subplan gave us something then return it
+			 * as-is. We do NOT make use of the result slot that was
+			 * set up in ExecInitAppend; there's no need for it.
 			 */
+			node->as_whichplan = n;
 			ExecReturnTuple(&node->ps, result);
 			return;
 		}
 
+		/* Tuple has been exhausted on this subnode */
+		if (node->as_async)
+		{
+			node->as_finished[n++] = true;
+			continue;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
 		 * ExecInitAppend.
 		 */
 		if (ScanDirectionIsForward(node->ps.state->es_direction))
-			node->as_whichplan++;
+		{
+			if (n >= node->as_nplans - 1)
+				break;
+			n++;
+		}
 		else
-			node->as_whichplan--;
-		if (!exec_append_initialize_next(node))
 		{
-			ExecReturnTuple(&node->ps,
-							ExecClearTuple(node->ps.ps_ResultTupleSlot));
-			return;
+			if (n == 0)
+				break;
+			n--;
 		}
+	}
 
-		/* Else loop back and try to get a tuple from the new subplan */
+	/*
+	 * We are finished if reached here and no subnodes are not-ready
+	 */
+	if (n_notready == 0)
+	{
+		node->as_whichplan = n;
+		ExecReturnTuple(&node->ps,
+						ExecClearTuple(node->ps.ps_ResultTupleSlot));
 	}
 }
 
@@ -277,6 +337,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 9121537..e4f2bb6 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1170,6 +1170,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gentbl.sql"

CREATE EXTENSION postgres_fdw;
CREATE TABLE pl (a int, b int);
CREATE TABLE cl1 (LIKE pl) INHERITS (pl);
CREATE TABLE cl2 (LIKE pl) INHERITS (pl);
CREATE TABLE cl3 (LIKE pl) INHERITS (pl);
CREATE TABLE cl4 (LIKE pl) INHERITS (pl);
INSERT INTO cl1 (SELECT a, a FROM generate_series(0000000, 0999999) a);
INSERT INTO cl2 (SELECT a, a FROM generate_series(1000000, 1999999) a);
INSERT INTO cl3 (SELECT a, a FROM generate_series(2000000, 2999999) a);
INSERT INTO cl4 (SELECT a, a FROM generate_series(3000000, 3999999) a);

CREATE TABLE t0 (LIKE pl);
INSERT INTO t0 (SELECT a, a FROM generate_series(0000000, 9999999) a);

CREATE SERVER sv0 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv1 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv3 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE SERVER sv4 FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host '/tmp', dbname 'postgres');
CREATE USER MAPPING FOR public SERVER sv0;
CREATE USER MAPPING FOR public SERVER sv1;
CREATE USER MAPPING FOR public SERVER sv2;
CREATE USER MAPPING FOR public SERVER sv3;
CREATE USER MAPPING FOR public SERVER sv4;

CREATE FOREIGN TABLE ft10 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft20 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft30 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft40 (a int, b int) SERVER sv0 OPTIONS (table_name 'cl4');
CREATE FOREIGN TABLE ft11 (a int, b int) SERVER sv1 OPTIONS (table_name 'cl1');
CREATE FOREIGN TABLE ft22 (a int, b int) SERVER sv2 OPTIONS (table_name 'cl2');
CREATE FOREIGN TABLE ft33 (a int, b int) SERVER sv3 OPTIONS (table_name 'cl3');
CREATE FOREIGN TABLE ft44 (a int, b int) SERVER sv4 OPTIONS (table_name 'cl4');

CREATE TABLE pf0 (LIKE pl);
ALTER FOREIGN TABLE ft10 INHERIT pf0;
ALTER FOREIGN TABLE ft20 INHERIT pf0;
ALTER FOREIGN TABLE ft30 INHERIT pf0;
ALTER FOREIGN TABLE ft40 INHERIT pf0;

CREATE table pf1 (LIKE pl);
ALTER FOREIGN TABLE ft11 INHERIT pf1;
ALTER FOREIGN TABLE ft22 INHERIT pf1;
ALTER FOREIGN TABLE ft33 INHERIT pf1;
ALTER FOREIGN TABLE ft44 INHERIT pf1;

ANALYZE;

----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="testrun.sh"

#! /bin/bash

function do_test() {
	echo $1
	for i in $(seq 1 10); do psql postgres -c "set log_min_duration_statement = 0; set client_min_messages=log; select sum(a) from $1"; done | grep LOG
}

for i in "t0" "pl" "pf0" "pf1";
do
  do_test $i
done


----Next_Part(Wed_Jul_06_16_29_14_2016_599)--
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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
2.9.2


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH 7/7] Make Append node async-aware.
@ 2016-06-28 09:52  Kyotaro Horiguchi <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Kyotaro Horiguchi @ 2016-06-28 09:52 UTC (permalink / raw)

Change append node to be capable to handle asynchronous children
properly. As soon as it receives !async_ready from a child, it moves
to the next child and if no child is ready, it sleeps until at least
one of them become ready.
---
 src/backend/executor/nodeAppend.c | 67 +++++++++++++++++++++++++++++++++++++--
 src/include/nodes/execnodes.h     |  2 ++
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index e0ce8c6..9a4063a 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -58,6 +58,7 @@
 #include "postgres.h"
 
 #include "executor/execdebug.h"
+#include "executor/execAsync.h"
 #include "executor/nodeAppend.h"
 
 static bool exec_append_initialize_next(AppendState *appendstate);
@@ -121,6 +122,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 {
 	AppendState *appendstate = makeNode(AppendState);
 	PlanState **appendplanstates;
+	bool	   *finished;
 	int			nplans;
 	int			i;
 	ListCell   *lc;
@@ -134,14 +136,17 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	nplans = list_length(node->appendplans);
 
 	appendplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));
-
+	finished = (bool *) palloc0(nplans * sizeof(bool));
+	
 	/*
 	 * create new AppendState for our append node
 	 */
 	appendstate->ps.plan = (Plan *) node;
 	appendstate->ps.state = estate;
 	appendstate->appendplans = appendplanstates;
+	appendstate->as_finished = finished;
 	appendstate->as_nplans = nplans;
+	appendstate->as_async = ((eflags & EXEC_FLAG_BACKWARD) == 0);
 
 	/*
 	 * Miscellaneous initialization
@@ -194,6 +199,8 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 void
 ExecAppend(AppendState *node)
 {
+	int stopplan = node->as_whichplan;
+
 	for (;;)
 	{
 		PlanState  *subnode;
@@ -207,7 +214,36 @@ ExecAppend(AppendState *node)
 		/*
 		 * get a tuple from the subplan
 		 */
-		result = ExecProcNode(subnode);
+		Assert(!node->as_finished[node->as_whichplan]);
+
+		if (!subnode->result_ready)
+			ExecExecuteNode(subnode);
+
+		if (!subnode->result_ready)
+		{
+			if (node->as_async)
+			{
+				/* Move to the next living node */
+				do
+				{
+					node->as_whichplan = 
+						(node->as_whichplan + 1) %  node->as_nplans;
+				} while (node->as_whichplan != stopplan &&
+						 node->as_finished[node->as_whichplan]);
+
+				/* No node is ready yet, return as not-ready */
+				if (node->as_whichplan == stopplan)
+					return;
+
+				/* Try the next node */
+				continue;
+			}
+
+			/* If not async, immediately wait for this subnode */
+			ExecAsyncWaitForNode(subnode);
+		}				
+
+		result = ExecConsumeResult((PlanState *) subnode);
 
 		if (!TupIsNull(result))
 		{
@@ -220,6 +256,31 @@ ExecAppend(AppendState *node)
 			return;
 		}
 
+		if (node->as_async)
+		{
+			node->as_finished[node->as_whichplan] = true;
+			stopplan = node->as_whichplan;
+
+			/* Find the next living subnode */
+			do
+			{
+				node->as_whichplan =
+					(node->as_whichplan + 1) % node->as_nplans;
+			} while (node->as_whichplan != stopplan &&
+					 node->as_finished[node->as_whichplan]);
+
+			if (node->as_whichplan != stopplan)
+			{
+				stopplan = node->as_whichplan;
+				continue;
+			}
+
+			/* All subnodes are exhausted. Finish this node. */
+			ExecReturnTuple(&node->ps,
+							ExecClearTuple(node->ps.ps_ResultTupleSlot));
+			return;
+		}
+
 		/*
 		 * Go on to the "next" subplan in the appropriate direction. If no
 		 * more subplans, return the empty slot set up for us by
@@ -277,6 +338,8 @@ ExecReScanAppend(AppendState *node)
 	{
 		PlanState  *subnode = node->appendplans[i];
 
+		node->as_finished[i] = false;
+
 		/*
 		 * ExecReScan doesn't know about my subplans, so I have to do
 		 * changed-parameter signaling myself.
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b72decc..b0a86c5 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1177,6 +1177,8 @@ typedef struct AppendState
 {
 	PlanState	ps;				/* its first field is NodeTag */
 	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	bool		as_async;		/* true to allow async execution */
+	bool	   *as_finished;	/* array of the running state of subplans */
 	int			as_nplans;
 	int			as_whichplan;
 } AppendState;
-- 
1.8.3.1


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^ permalink  raw  reply  [nested|flat] 55+ messages in thread

* [PATCH v54 1/5] Introduce an option to make logical replication database specific.
@ 2026-04-05 07:51  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 55+ messages in thread

From: Antonin Houska @ 2026-04-05 07:51 UTC (permalink / raw)

By default, the logical decoding assumes access to shared catalogs, so the
snapshot builder needs to consider cluster-wide XIDs during startup. That in
turn means that, if any transaction is already running (and has XID assigned),
the snapshot builder needs to wait for its completion, as it does not know if
that transaction performed catalog changes earlier.

Possible problem with this concept is that if REPACK (CONCURRENTLY) is running
in some database, backends running the same command in other databases get
stuck until the first one has committed. Thus only as single backend in the
cluster can run REPACK (CONCURRENTLY) at any time. Likewise, REPACK
(CONCURRENTLY) can block walsenders starting on behalf of subscriptions
throughout the cluster.

This patch adds a new option to logical replication output plugin, to declare
that it does not use shared catalogs (i.e. catalogs that can be changed by
transactions running in other databases in the cluster). In that case, no
snapshot the backend will use during the decoding needs to contain information
about transactions running in other databases. Thus the snapshot builder only
needs to wait for completion of transactions in the current database.

Currently we only use this option in the REPACK background worker. It could
possibly be used in the plugin for logical replication too, however that would
need thorough analysis of that plugin.

The patch bumps WAL version number, due to a new field in xl_running_xacts.
---
 contrib/pg_visibility/pg_visibility.c       |  4 +-
 doc/src/sgml/logicaldecoding.sgml           |  4 ++
 src/backend/access/index/genam.c            |  8 +++
 src/backend/access/rmgrdesc/standbydesc.c   |  2 +
 src/backend/access/transam/xlog.c           |  2 +-
 src/backend/access/transam/xlogfuncs.c      |  2 +-
 src/backend/postmaster/bgwriter.c           |  2 +-
 src/backend/replication/logical/decode.c    |  8 ++-
 src/backend/replication/logical/logical.c   |  3 ++
 src/backend/replication/logical/snapbuild.c | 54 +++++++++++++++++++--
 src/backend/replication/slot.c              |  2 +-
 src/backend/storage/ipc/procarray.c         | 23 ++++++++-
 src/backend/storage/ipc/standby.c           | 14 +++++-
 src/include/access/genam.h                  |  7 +++
 src/include/access/xlog_internal.h          |  2 +-
 src/include/replication/output_plugin.h     |  1 +
 src/include/replication/snapbuild.h         |  3 +-
 src/include/storage/procarray.h             |  2 +-
 src/include/storage/standby.h               |  3 +-
 src/include/storage/standbydefs.h           |  1 +
 20 files changed, 128 insertions(+), 19 deletions(-)

diff --git a/contrib/pg_visibility/pg_visibility.c b/contrib/pg_visibility/pg_visibility.c
index dfab0b64cf5..d564bd2a00c 100644
--- a/contrib/pg_visibility/pg_visibility.c
+++ b/contrib/pg_visibility/pg_visibility.c
@@ -621,7 +621,7 @@ GetStrictOldestNonRemovableTransactionId(Relation rel)
 	else if (rel == NULL || rel->rd_rel->relisshared)
 	{
 		/* Shared relation: take into account all running xids */
-		runningTransactions = GetRunningTransactionData();
+		runningTransactions = GetRunningTransactionData(InvalidOid);
 		LWLockRelease(ProcArrayLock);
 		LWLockRelease(XidGenLock);
 		return runningTransactions->oldestRunningXid;
@@ -632,7 +632,7 @@ GetStrictOldestNonRemovableTransactionId(Relation rel)
 		 * Normal relation: take into account xids running within the current
 		 * database
 		 */
-		runningTransactions = GetRunningTransactionData();
+		runningTransactions = GetRunningTransactionData(InvalidOid);
 		LWLockRelease(ProcArrayLock);
 		LWLockRelease(XidGenLock);
 		return runningTransactions->oldestDatabaseRunningXid;
diff --git a/doc/src/sgml/logicaldecoding.sgml b/doc/src/sgml/logicaldecoding.sgml
index 6dc49108997..28089d1053c 100644
--- a/doc/src/sgml/logicaldecoding.sgml
+++ b/doc/src/sgml/logicaldecoding.sgml
@@ -959,6 +959,7 @@ typedef struct OutputPluginOptions
 {
     OutputPluginOutputType output_type;
     bool        receive_rewrites;
+    bool        need_shared_catalogs;
 } OutputPluginOptions;
 </programlisting>
       <literal>output_type</literal> has to either be set to
@@ -969,6 +970,9 @@ typedef struct OutputPluginOptions
       also be called for changes made by heap rewrites during certain DDL
       operations.  These are of interest to plugins that handle DDL
       replication, but they require special handling.
+      <literal>need_shared_catalogs</literal> can be set to false if you are
+      sure the plugin functions do not access shared system catalogs. It can
+      speed up creation of replication slots that use this plugin.
      </para>
 
      <para>
diff --git a/src/backend/access/index/genam.c b/src/backend/access/index/genam.c
index 1408989c568..44df2605068 100644
--- a/src/backend/access/index/genam.c
+++ b/src/backend/access/index/genam.c
@@ -394,6 +394,14 @@ systable_beginscan(Relation heapRelation,
 	SysScanDesc sysscan;
 	Relation	irel;
 
+	/*
+	 * If this backend promised that it won't access shared catalogs during
+	 * logical decoding, this seems to be the right place to check.
+	 */
+	Assert(!HistoricSnapshotActive() ||
+		   accessSharedCatalogsInDecoding ||
+		   !heapRelation->rd_rel->relisshared);
+
 	if (indexOK &&
 		!IgnoreSystemIndexes &&
 		!ReindexIsProcessingIndex(indexId))
diff --git a/src/backend/access/rmgrdesc/standbydesc.c b/src/backend/access/rmgrdesc/standbydesc.c
index 0a291354ae2..685d1bdb024 100644
--- a/src/backend/access/rmgrdesc/standbydesc.c
+++ b/src/backend/access/rmgrdesc/standbydesc.c
@@ -41,6 +41,8 @@ standby_desc_running_xacts(StringInfo buf, xl_running_xacts *xlrec)
 		for (i = 0; i < xlrec->subxcnt; i++)
 			appendStringInfo(buf, " %u", xlrec->xids[xlrec->xcnt + i]);
 	}
+
+	appendStringInfo(buf, "; dbid: %u", xlrec->dbid);
 }
 
 void
diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 9e8999bbb61..1a6c1456d2c 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -7731,7 +7731,7 @@ CreateCheckPoint(int flags)
 	 * recovery we don't need to write running xact data.
 	 */
 	if (!shutdown && XLogStandbyInfoActive())
-		LogStandbySnapshot();
+		LogStandbySnapshot(InvalidOid);
 
 	START_CRIT_SECTION();
 
diff --git a/src/backend/access/transam/xlogfuncs.c b/src/backend/access/transam/xlogfuncs.c
index 65bbaeda59c..0f5979691e6 100644
--- a/src/backend/access/transam/xlogfuncs.c
+++ b/src/backend/access/transam/xlogfuncs.c
@@ -245,7 +245,7 @@ pg_log_standby_snapshot(PG_FUNCTION_ARGS)
 				(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
 				 errmsg("pg_log_standby_snapshot() can only be used if \"wal_level\" >= \"replica\"")));
 
-	recptr = LogStandbySnapshot();
+	recptr = LogStandbySnapshot(InvalidOid);
 
 	/*
 	 * As a convenience, return the WAL location of the last inserted record
diff --git a/src/backend/postmaster/bgwriter.c b/src/backend/postmaster/bgwriter.c
index 1d8947774a9..a30de4262eb 100644
--- a/src/backend/postmaster/bgwriter.c
+++ b/src/backend/postmaster/bgwriter.c
@@ -289,7 +289,7 @@ BackgroundWriterMain(const void *startup_data, size_t startup_data_len)
 			if (now >= timeout &&
 				last_snapshot_lsn <= GetLastImportantRecPtr())
 			{
-				last_snapshot_lsn = LogStandbySnapshot();
+				last_snapshot_lsn = LogStandbySnapshot(InvalidOid);
 				last_snapshot_ts = now;
 			}
 		}
diff --git a/src/backend/replication/logical/decode.c b/src/backend/replication/logical/decode.c
index 57aaef57c61..4299d0bc867 100644
--- a/src/backend/replication/logical/decode.c
+++ b/src/backend/replication/logical/decode.c
@@ -381,7 +381,13 @@ standby_decode(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
 			{
 				xl_running_xacts *running = (xl_running_xacts *) XLogRecGetData(r);
 
-				SnapBuildProcessRunningXacts(builder, buf->origptr, running);
+
+				/*
+				 * If the plugin does not access shared catalogs, only keep
+				 * track of transactions in the current database.
+				 */
+				SnapBuildProcessRunningXacts(builder, buf->origptr, running,
+											 !ctx->options.need_shared_catalogs);
 
 				/*
 				 * Abort all transactions that we keep track of, that are
diff --git a/src/backend/replication/logical/logical.c b/src/backend/replication/logical/logical.c
index f20d0c542f3..8ceaf64d164 100644
--- a/src/backend/replication/logical/logical.c
+++ b/src/backend/replication/logical/logical.c
@@ -285,6 +285,9 @@ StartupDecodingContext(List *output_plugin_options,
 	ctx->write = do_write;
 	ctx->update_progress = update_progress;
 
+	/* Assume shared catalog access. The startup callback can change it. */
+	ctx->options.need_shared_catalogs = true;
+
 	ctx->output_plugin_options = output_plugin_options;
 
 	ctx->fast_forward = fast_forward;
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index b4269a3b102..8ef2326c66d 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -125,6 +125,7 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
+#include "access/genam.h"
 #include "access/heapam_xlog.h"
 #include "access/transam.h"
 #include "access/xact.h"
@@ -154,6 +155,14 @@
 static ResourceOwner SavedResourceOwnerDuringExport = NULL;
 static bool ExportInProgress = false;
 
+/*
+ * If a backend is going to do logical decoding and the output plugin does
+ * not need to access shared catalogs, setting this variable to false can make
+ * the decoding startup faster. In particular, the backend will not need to
+ * wait for completion of already running transactions in other databases.
+ */
+bool		accessSharedCatalogsInDecoding = true;
+
 /* ->committed and ->catchange manipulation */
 static void SnapBuildPurgeOlderTxn(SnapBuild *builder);
 
@@ -170,7 +179,8 @@ static inline bool SnapBuildXidHasCatalogChanges(SnapBuild *builder, Transaction
 												 uint32 xinfo);
 
 /* xlog reading helper functions for SnapBuildProcessRunningXacts */
-static bool SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *running);
+static bool SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn,
+								  xl_running_xacts *running, bool db_specific);
 static void SnapBuildWaitSnapshot(xl_running_xacts *running, TransactionId cutoff);
 
 /* serialization functions */
@@ -1136,7 +1146,8 @@ SnapBuildXidHasCatalogChanges(SnapBuild *builder, TransactionId xid,
  * anymore.
  */
 void
-SnapBuildProcessRunningXacts(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *running)
+SnapBuildProcessRunningXacts(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *running,
+							 bool db_specific)
 {
 	ReorderBufferTXN *txn;
 	TransactionId xmin;
@@ -1149,12 +1160,21 @@ SnapBuildProcessRunningXacts(SnapBuild *builder, XLogRecPtr lsn, xl_running_xact
 	if (builder->state < SNAPBUILD_CONSISTENT)
 	{
 		/* returns false if there's no point in performing cleanup just yet */
-		if (!SnapBuildFindSnapshot(builder, lsn, running))
+		if (!SnapBuildFindSnapshot(builder, lsn, running, db_specific))
 			return;
 	}
 	else
 		SnapBuildSerialize(builder, lsn);
 
+	/*
+	 * If database specific transaction info was used during startup, the info
+	 * for the whole cluster can make xmin go backwards. The code below
+	 * probably does not expect that, let's wait with the cleanup for the next
+	 * record.
+	 */
+	if (!NormalTransactionIdFollows(running->oldestRunningXid, builder->xmin))
+		return;
+
 	/*
 	 * Update range of interesting xids based on the running xacts
 	 * information. We don't increase ->xmax using it, because once we are in
@@ -1238,7 +1258,8 @@ SnapBuildProcessRunningXacts(SnapBuild *builder, XLogRecPtr lsn, xl_running_xact
  * using the xl_running_xacts record.
  */
 static bool
-SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *running)
+SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *running,
+					  bool db_specific)
 {
 	/* ---
 	 * Build catalog decoding snapshot incrementally using information about
@@ -1265,6 +1286,25 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 	 * ---
 	 */
 
+	if (db_specific)
+	{
+		/*
+		 * If we must only keep track of transactions running in the current
+		 * database, we need transaction info from exactly that database.
+		 */
+		if (running->dbid != MyDatabaseId)
+		{
+			LogStandbySnapshot(MyDatabaseId);
+			return false;
+		}
+
+		/*
+		 * We'd better be able to check during scan if the plugin does not
+		 * lie.
+		 */
+		accessSharedCatalogsInDecoding = false;
+	}
+
 	/*
 	 * xl_running_xacts record is older than what we can use, we might not
 	 * have all necessary catalog rows anymore.
@@ -1465,7 +1505,11 @@ SnapBuildWaitSnapshot(xl_running_xacts *running, TransactionId cutoff)
 	 */
 	if (!RecoveryInProgress())
 	{
-		LogStandbySnapshot();
+		/*
+		 * If the last transaction info was about specific database, so needs
+		 * to be the next one - at least until we're in the CONSISTENT state.
+		 */
+		LogStandbySnapshot(running->dbid);
 	}
 }
 
diff --git a/src/backend/replication/slot.c b/src/backend/replication/slot.c
index a9092fc2382..9533515a63b 100644
--- a/src/backend/replication/slot.c
+++ b/src/backend/replication/slot.c
@@ -1762,7 +1762,7 @@ ReplicationSlotReserveWal(void)
 		XLogRecPtr	flushptr;
 
 		/* make sure we have enough information to start */
-		flushptr = LogStandbySnapshot();
+		flushptr = LogStandbySnapshot(InvalidOid);
 
 		/* and make sure it's fsynced to disk */
 		XLogFlush(flushptr);
diff --git a/src/backend/storage/ipc/procarray.c b/src/backend/storage/ipc/procarray.c
index cc207cb56e3..92ed34128e5 100644
--- a/src/backend/storage/ipc/procarray.c
+++ b/src/backend/storage/ipc/procarray.c
@@ -2631,9 +2631,11 @@ ProcArrayInstallRestoredXmin(TransactionId xmin, PGPROC *proc)
  *
  * Note that if any transaction has overflowed its cached subtransactions
  * then there is no real need include any subtransactions.
+ *
+ * If 'dbid' is valid, only gather transactions running in that database.
  */
 RunningTransactions
-GetRunningTransactionData(void)
+GetRunningTransactionData(Oid dbid)
 {
 	/* result workspace */
 	static RunningTransactionsData CurrentRunningXactsData;
@@ -2708,6 +2710,18 @@ GetRunningTransactionData(void)
 		if (!TransactionIdIsValid(xid))
 			continue;
 
+		/*
+		 * Filter by database OID if requested.
+		 */
+		if (OidIsValid(dbid))
+		{
+			int			pgprocno = arrayP->pgprocnos[index];
+			PGPROC	   *proc = &allProcs[pgprocno];
+
+			if (proc->databaseId != dbid)
+				continue;
+		}
+
 		/*
 		 * Be careful not to exclude any xids before calculating the values of
 		 * oldestRunningXid and suboverflowed, since these are used to clean
@@ -2758,6 +2772,12 @@ GetRunningTransactionData(void)
 			PGPROC	   *proc = &allProcs[pgprocno];
 			int			nsubxids;
 
+			/*
+			 * Filter by database OID if requested.
+			 */
+			if (OidIsValid(dbid) && proc->databaseId != dbid)
+				continue;
+
 			/*
 			 * Save subtransaction XIDs. Other backends can't add or remove
 			 * entries while we're holding XidGenLock.
@@ -2791,6 +2811,7 @@ GetRunningTransactionData(void)
 	 * increases if slots do.
 	 */
 
+	CurrentRunningXacts->dbid = dbid;
 	CurrentRunningXacts->xcnt = count - subcount;
 	CurrentRunningXacts->subxcnt = subcount;
 	CurrentRunningXacts->subxid_status = suboverflowed ? SUBXIDS_IN_SUBTRANS : SUBXIDS_IN_ARRAY;
diff --git a/src/backend/storage/ipc/standby.c b/src/backend/storage/ipc/standby.c
index de9092fdf5b..c653ea742bc 100644
--- a/src/backend/storage/ipc/standby.c
+++ b/src/backend/storage/ipc/standby.c
@@ -1188,6 +1188,14 @@ standby_redo(XLogReaderState *record)
 		xl_running_xacts *xlrec = (xl_running_xacts *) XLogRecGetData(record);
 		RunningTransactionsData running;
 
+		/*
+		 * Records issued for specific database are not suitable for physical
+		 * replication because that affects the whole cluster. In particular,
+		 * the list of XID is probably incomplete here.
+		 */
+		if (OidIsValid(xlrec->dbid))
+			return;
+
 		running.xcnt = xlrec->xcnt;
 		running.subxcnt = xlrec->subxcnt;
 		running.subxid_status = xlrec->subxid_overflow ? SUBXIDS_MISSING : SUBXIDS_IN_ARRAY;
@@ -1277,11 +1285,12 @@ standby_redo(XLogReaderState *record)
  * as there's no independent knob to just enable logical decoding. For
  * details of how this is used, check snapbuild.c's introductory comment.
  *
+ * If 'dbid' is valid, only gather transactions running in that database.
  *
  * Returns the RecPtr of the last inserted record.
  */
 XLogRecPtr
-LogStandbySnapshot(void)
+LogStandbySnapshot(Oid dbid)
 {
 	XLogRecPtr	recptr;
 	RunningTransactions running;
@@ -1314,7 +1323,7 @@ LogStandbySnapshot(void)
 	 * Log details of all in-progress transactions. This should be the last
 	 * record we write, because standby will open up when it sees this.
 	 */
-	running = GetRunningTransactionData();
+	running = GetRunningTransactionData(dbid);
 
 	/*
 	 * GetRunningTransactionData() acquired ProcArrayLock, we must release it.
@@ -1358,6 +1367,7 @@ LogCurrentRunningXacts(RunningTransactions CurrRunningXacts)
 	xl_running_xacts xlrec;
 	XLogRecPtr	recptr;
 
+	xlrec.dbid = CurrRunningXacts->dbid;
 	xlrec.xcnt = CurrRunningXacts->xcnt;
 	xlrec.subxcnt = CurrRunningXacts->subxcnt;
 	xlrec.subxid_overflow = (CurrRunningXacts->subxid_status != SUBXIDS_IN_ARRAY);
diff --git a/src/include/access/genam.h b/src/include/access/genam.h
index b69320a7fc8..c9a52277be1 100644
--- a/src/include/access/genam.h
+++ b/src/include/access/genam.h
@@ -136,6 +136,13 @@ typedef struct IndexOrderByDistance
 	bool		isnull;
 } IndexOrderByDistance;
 
+
+/*
+ * Keep track of whether logical decoding in this backend promised not to
+ * access shared catalogs, as a safety check.  Somewhat misplaced, but ...
+ */
+extern bool accessSharedCatalogsInDecoding;
+
 /*
  * generalized index_ interface routines (in indexam.c)
  */
diff --git a/src/include/access/xlog_internal.h b/src/include/access/xlog_internal.h
index 10c18d39ff8..13ae3ad4fbb 100644
--- a/src/include/access/xlog_internal.h
+++ b/src/include/access/xlog_internal.h
@@ -32,7 +32,7 @@
 /*
  * Each page of XLOG file has a header like this:
  */
-#define XLOG_PAGE_MAGIC 0xD11E	/* can be used as WAL version indicator */
+#define XLOG_PAGE_MAGIC 0xD11F	/* can be used as WAL version indicator */
 
 typedef struct XLogPageHeaderData
 {
diff --git a/src/include/replication/output_plugin.h b/src/include/replication/output_plugin.h
index 842fcde67f9..917f3cff232 100644
--- a/src/include/replication/output_plugin.h
+++ b/src/include/replication/output_plugin.h
@@ -27,6 +27,7 @@ typedef struct OutputPluginOptions
 {
 	OutputPluginOutputType output_type;
 	bool		receive_rewrites;
+	bool		need_shared_catalogs;
 } OutputPluginOptions;
 
 /*
diff --git a/src/include/replication/snapbuild.h b/src/include/replication/snapbuild.h
index a22a83a2f23..d02530a912a 100644
--- a/src/include/replication/snapbuild.h
+++ b/src/include/replication/snapbuild.h
@@ -92,7 +92,8 @@ extern void SnapBuildProcessNewCid(SnapBuild *builder, TransactionId xid,
 								   XLogRecPtr lsn,
 								   xl_heap_new_cid *xlrec);
 extern void SnapBuildProcessRunningXacts(SnapBuild *builder, XLogRecPtr lsn,
-										 xl_running_xacts *running);
+										 xl_running_xacts *running,
+										 bool db_specific);
 extern void SnapBuildSerializationPoint(SnapBuild *builder, XLogRecPtr lsn);
 
 extern bool SnapBuildSnapshotExists(XLogRecPtr lsn);
diff --git a/src/include/storage/procarray.h b/src/include/storage/procarray.h
index abdf021e66e..377b3060b9f 100644
--- a/src/include/storage/procarray.h
+++ b/src/include/storage/procarray.h
@@ -49,7 +49,7 @@ extern bool ProcArrayInstallImportedXmin(TransactionId xmin,
 										 VirtualTransactionId *sourcevxid);
 extern bool ProcArrayInstallRestoredXmin(TransactionId xmin, PGPROC *proc);
 
-extern RunningTransactions GetRunningTransactionData(void);
+extern RunningTransactions GetRunningTransactionData(Oid dbid);
 
 extern bool TransactionIdIsInProgress(TransactionId xid);
 extern TransactionId GetOldestNonRemovableTransactionId(Relation rel);
diff --git a/src/include/storage/standby.h b/src/include/storage/standby.h
index 6a314c693cd..8715c08e94f 100644
--- a/src/include/storage/standby.h
+++ b/src/include/storage/standby.h
@@ -126,6 +126,7 @@ typedef enum
 
 typedef struct RunningTransactionsData
 {
+	Oid			dbid;			/* only track xacts in this database */
 	int			xcnt;			/* # of xact ids in xids[] */
 	int			subxcnt;		/* # of subxact ids in xids[] */
 	subxids_array_status subxid_status;
@@ -143,7 +144,7 @@ typedef RunningTransactionsData *RunningTransactions;
 extern void LogAccessExclusiveLock(Oid dbOid, Oid relOid);
 extern void LogAccessExclusiveLockPrepare(void);
 
-extern XLogRecPtr LogStandbySnapshot(void);
+extern XLogRecPtr LogStandbySnapshot(Oid dbid);
 extern void LogStandbyInvalidations(int nmsgs, SharedInvalidationMessage *msgs,
 									bool relcacheInitFileInval);
 
diff --git a/src/include/storage/standbydefs.h b/src/include/storage/standbydefs.h
index 231d251fd51..e75b7078766 100644
--- a/src/include/storage/standbydefs.h
+++ b/src/include/storage/standbydefs.h
@@ -46,6 +46,7 @@ typedef struct xl_standby_locks
  */
 typedef struct xl_running_xacts
 {
+	Oid			dbid;			/* only track xacts in this database */
 	int			xcnt;			/* # of xact ids in xids[] */
 	int			subxcnt;		/* # of subxact ids in xids[] */
 	bool		subxid_overflow;	/* snapshot overflowed, subxids missing */
-- 
2.47.3


--cdhh4t7ukb6tnjoq
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v54-0002-Rename-cluster.c-h-repack.c-h.patch"



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2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
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2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2016-06-28 09:52 [PATCH 7/7] Make Append node async-aware. Kyotaro Horiguchi <[email protected]>
2026-04-05 07:51 [PATCH v54 1/5] Introduce an option to make logical replication database specific. Antonin Houska <[email protected]>

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