Subject: [PATCH v4] Include the leader PID in logfile

From: Justin Pryzby <[email-masked]>
Date: Fri, 13 Mar 2020 22:03:06 -0500

See also: b025f32e0b, which added the leader PID to pg_stat_activity
---
 doc/src/sgml/config.sgml                      | 10 ++++++-
 src/backend/utils/error/elog.c                | 30 +++++++++++++++++++
 src/backend/utils/misc/postgresql.conf.sample |  1 +
 3 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 994155ca00..89dd19035c 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -6694,6 +6694,13 @@ local0.*    /var/log/postgresql
              <entry>Process ID</entry>
              <entry>no</entry>
             </row>
+            <row>
+             <entry><literal>%P</literal></entry>
+             <entry>For a parallel worker, this is the Process ID of its leader
+             process.
+             </entry>
+             <entry>no</entry>
+            </row>
             <row>
              <entry><literal>%t</literal></entry>
              <entry>Time stamp without milliseconds</entry>
@@ -7026,7 +7033,7 @@ log_line_prefix = '%m [%p] %q%u@%d/%a '
         character count of the error position therein,
         location of the error in the PostgreSQL source code
         (if <varname>log_error_verbosity</varname> is set to <literal>verbose</literal>),
-        application name, and backend type.
+        application name, backend type, and leader PID.
         Here is a sample table definition for storing CSV-format log output:
 
 <programlisting>
@@ -7056,6 +7063,7 @@ CREATE TABLE postgres_log
   location text,
   application_name text,
   backend_type text,
+  leader_pid integer,
   PRIMARY KEY (session_id, session_line_num)
 );
 </programlisting>
diff --git a/src/backend/utils/error/elog.c b/src/backend/utils/error/elog.c
index e4b717c79a..3055b72c01 100644
--- a/src/backend/utils/error/elog.c
+++ b/src/backend/utils/error/elog.c
@@ -77,6 +77,7 @@
 #include "postmaster/syslogger.h"
 #include "storage/ipc.h"
 #include "storage/proc.h"
+#include "storage/procarray.h"
 #include "tcop/tcopprot.h"
 #include "utils/guc.h"
 #include "utils/memutils.h"
@@ -2448,6 +2449,25 @@ log_line_prefix(StringInfo buf, ErrorData *edata)
 				else
 					appendStringInfo(buf, "%d", MyProcPid);
 				break;
+
+			case 'P':
+				if (MyProc)
+				{
+					PGPROC *leader = MyProc->lockGroupLeader;
+					if (leader == NULL || leader->pid == MyProcPid)
+						/* padding only */
+						appendStringInfoSpaces(buf,
+								padding > 0 ? padding : -padding);
+					else if (padding != 0)
+						appendStringInfo(buf, "%*d", padding, leader->pid);
+					else
+						appendStringInfo(buf, "%d", leader->pid);
+				}
+				else if (padding != 0)
+					appendStringInfoSpaces(buf,
+										   padding > 0 ? padding : -padding);
+				break;
+
 			case 'l':
 				if (padding != 0)
 					appendStringInfo(buf, "%*ld", padding, log_line_number);
@@ -2836,6 +2856,16 @@ write_csvlog(ErrorData *edata)
 	else
 		appendCSVLiteral(&buf, GetBackendTypeDesc(MyBackendType));
 
+	appendStringInfoChar(&buf, ',');
+
+	/* leader PID */
+	if (MyProc)
+	{
+		PGPROC *leader = MyProc->lockGroupLeader;
+		if (leader && leader->pid != MyProcPid)
+			appendStringInfo(&buf, "%d", leader->pid);
+	}
+
 	appendStringInfoChar(&buf, '\n');
 
 	/* If in the syslogger process, try to write messages direct to file */
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index b0715ae188..1ecdfc51a6 100644
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -537,6 +537,7 @@
 					#   %h = remote host
 					#   %b = backend type
 					#   %p = process ID
+					#   %P = leader PID
 					#   %t = timestamp without milliseconds
 					#   %m = timestamp with milliseconds
 					#   %n = timestamp with milliseconds (as a Unix epoch)
-- 
2.17.0

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