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Introduce "REFRESH SEQUENCES" for subscriptions.

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This patch adds support for a new SQL command:
ALTER SUBSCRIPTION ... REFRESH SEQUENCES
This command updates the sequence entries present in the
pg_subscription_rel catalog table with the INIT state to trigger
resynchronization.

In addition to the new command, the following subscription commands have
been enhanced to automatically refresh sequence mappings:
ALTER SUBSCRIPTION ... REFRESH PUBLICATION
ALTER SUBSCRIPTION ... ADD PUBLICATION
ALTER SUBSCRIPTION ... DROP PUBLICATION
ALTER SUBSCRIPTION ... SET PUBLICATION

These commands will perform the following actions:
Add newly published sequences that are not yet part of the subscription.
Remove sequences that are no longer included in the publication.

This ensures that sequence replication remains aligned with the current
state of the publication on the publisher side.

Note that the actual synchronization of sequence data/values will be
handled in a subsequent patch that introduces a dedicated sequence sync
worker.

Author: Vignesh C <vignesh21@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-by: shveta malik <shveta.malik@gmail.com>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com>
Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com>
Reviewed-by: Peter Smith <smithpb2250@gmail.com>
Reviewed-by: Nisha Moond <nisha.moond412@gmail.com>
Reviewed-by: Shlok Kyal <shlok.kyal.oss@gmail.com>
Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Reviewed-by: Hou Zhijie <houzj.fnst@fujitsu.com>
Discussion: https://postgr.es/m/CAA4eK1LC+KJiAkSrpE_NwvNdidw9F2os7GERUeSxSKv71gXysQ@mail.gmail.com
This commit is contained in:
Amit Kapila
2025-10-23 08:30:27 +00:00
parent 6ae08d9583
commit f0b3573c3a
19 changed files with 609 additions and 141 deletions
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1
src/test/subscription/meson.build
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@@ -45,6 +45,7 @@ tests += {
't/033_run_as_table_owner.pl',
't/034_temporal.pl',
't/035_conflicts.pl',
't/036_sequences.pl',
't/100_bugs.pl',
],
},

55
src/test/subscription/t/036_sequences.pl Normal file
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@@ -0,0 +1,55 @@
# Copyright (c) 2025, PostgreSQL Global Development Group
# This tests that sequences are registered to be synced to the subscriber
use strict;
use warnings;
use PostgreSQL::Test::Cluster;
use PostgreSQL::Test::Utils;
use Test::More;
# Initialize publisher node
my $node_publisher = PostgreSQL::Test::Cluster->new('publisher');
# Avoid checkpoint during the test, otherwise, extra values will be fetched for
# the sequences which will cause the test to fail randomly.
$node_publisher->init(allows_streaming => 'logical');
$node_publisher->start;
# Initialize subscriber node
my $node_subscriber = PostgreSQL::Test::Cluster->new('subscriber');
$node_subscriber->init;
$node_subscriber->start;
# Setup structure on the publisher
my $ddl = qq(
CREATE TABLE regress_seq_test (v BIGINT);
CREATE SEQUENCE regress_s1;
);
$node_publisher->safe_psql('postgres', $ddl);
# Setup the same structure on the subscriber
$node_subscriber->safe_psql('postgres', $ddl);
# Insert initial test data
$node_publisher->safe_psql(
'postgres', qq(
-- generate a number of values using the sequence
INSERT INTO regress_seq_test SELECT nextval('regress_s1') FROM generate_series(1,100);
));
# Setup logical replication pub/sub
my $publisher_connstr = $node_publisher->connstr . ' dbname=postgres';
$node_publisher->safe_psql('postgres',
"CREATE PUBLICATION regress_seq_pub FOR ALL SEQUENCES");
$node_subscriber->safe_psql('postgres',
"CREATE SUBSCRIPTION regress_seq_sub CONNECTION '$publisher_connstr' PUBLICATION regress_seq_pub"
);
# Confirm sequences can be listed in pg_subscription_rel
my $result = $node_subscriber->safe_psql('postgres',
"SELECT relname, srsubstate FROM pg_class, pg_subscription_rel WHERE oid = srrelid"
);
is($result, 'regress_s1|i', "Sequence can be in pg_subscription_rel catalog");
done_testing();