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commit    40295d158fd4d462c55e6debae19dcd43ab530a6
Author:   Amit Kapila <akapila@postgresql.org>
Date:     Mon Jul 19 05:24:21 2021 +0000

    Don't allow to set replication slot_name as ''.
    
    We don't allow to create replication slot_name as an empty string ('') via
    SQL API pg_create_logical_replication_slot() but it is allowed to be set
    via Alter Subscription command. This will lead to apply worker repeatedly
    keep trying to stream data via slot_name '' and the user is not allowed to
    create the slot with that name.
    
    Author: Japin Li
    Reviewed-By: Ranier Vilela, Amit Kapila
    Backpatch-through: 10, where it was introduced
    Discussion: https://postgr.es/m/MEYP282MB1669CBD98E721C77CA696499B61A9@MEYP282MB1669.AUSP282.PROD.OUTLOOK.COM


 src/backend/commands/subscriptioncmds.c    | 2 ++
 src/test/regress/expected/subscription.out | 3 +++
 src/test/regress/sql/subscription.sql      | 3 +++
 3 files changed, 8 insertions(+)

diff --git a/src/backend/commands/subscriptioncmds.c b/src/backend/commands/subscriptioncmds.c
index b862e59f1da..e096d5fd2d5 100644
--- a/src/backend/commands/subscriptioncmds.c
+++ b/src/backend/commands/subscriptioncmds.c
@@ -159,6 +159,8 @@ parse_subscription_options(List *options,
 			/* Setting slot_name = NONE is treated as no slot name. */
 			if (strcmp(*slot_name, "none") == 0)
 				*slot_name = NULL;
+			else
+				ReplicationSlotValidateName(*slot_name, ERROR);
 		}
 		else if (strcmp(defel->defname, "copy_data") == 0 && copy_data)
 		{
diff --git a/src/test/regress/expected/subscription.out b/src/test/regress/expected/subscription.out
index 57f7dd9b0a7..4ac7259f3a5 100644
--- a/src/test/regress/expected/subscription.out
+++ b/src/test/regress/expected/subscription.out
@@ -86,6 +86,9 @@ ALTER SUBSCRIPTION regress_testsub SET PUBLICATION testpub2, testpub3 WITH (refr
 ALTER SUBSCRIPTION regress_testsub CONNECTION 'dbname=regress_doesnotexist2';
 ALTER SUBSCRIPTION regress_testsub SET (slot_name = 'newname');
 -- fail
+ALTER SUBSCRIPTION regress_testsub SET (slot_name = '');
+ERROR:  replication slot name "" is too short
+-- fail
 ALTER SUBSCRIPTION regress_doesnotexist CONNECTION 'dbname=regress_doesnotexist2';
 ERROR:  subscription "regress_doesnotexist" does not exist
 ALTER SUBSCRIPTION regress_testsub SET (create_slot = false);
diff --git a/src/test/regress/sql/subscription.sql b/src/test/regress/sql/subscription.sql
index 308c098c144..c9d1bd89488 100644
--- a/src/test/regress/sql/subscription.sql
+++ b/src/test/regress/sql/subscription.sql
@@ -65,6 +65,9 @@ ALTER SUBSCRIPTION regress_testsub SET PUBLICATION testpub2, testpub3 WITH (refr
 ALTER SUBSCRIPTION regress_testsub CONNECTION 'dbname=regress_doesnotexist2';
 ALTER SUBSCRIPTION regress_testsub SET (slot_name = 'newname');
 
+-- fail
+ALTER SUBSCRIPTION regress_testsub SET (slot_name = '');
+
 -- fail
 ALTER SUBSCRIPTION regress_doesnotexist CONNECTION 'dbname=regress_doesnotexist2';
 ALTER SUBSCRIPTION regress_testsub SET (create_slot = false);


[parent: 6d0dc1a7da79]