# Copyright (c) 2021-2025, PostgreSQL Global Development Group
# Test streaming of transaction containing multiple subtransactions and rollbacks
use strict;
use warnings FATAL => 'all';
use PostgreSQL::Test::Cluster;
use PostgreSQL::Test::Utils;
use Test::More;
# Check that the parallel apply worker has finished applying the streaming # transaction.
sub check_parallel_log
{
my ($node_subscriber, $offset, $is_parallel, $type) = @_;
if ($is_parallel)
{
$node_subscriber->wait_for_log(
qr/DEBUG: ( [A-Z0-9]+:)? finished processing the STREAM $type command/,
$offset);
}
}
# Common test steps for both the streaming=on and streaming=parallel cases.
sub test_streaming
{
my ($node_publisher, $node_subscriber, $appname, $is_parallel) = @_;
my $offset = 0;
# Check the subscriber log from now on.
$offset = -s $node_subscriber->logfile;
# streamed transaction with DDL, DML and ROLLBACKs
$node_publisher->safe_psql( 'postgres', q{
BEGIN;
INSERT INTO test_tab VALUES (3, sha256(3::text::bytea));
SAVEPOINT s1;
INSERT INTO test_tab VALUES (4, sha256(4::text::bytea));
SAVEPOINT s2;
INSERT INTO test_tab VALUES (5, sha256(5::text::bytea));
SAVEPOINT s3;
INSERT INTO test_tab VALUES (6, sha256(6::text::bytea));
ROLLBACK TO s2;
INSERT INTO test_tab VALUES (7, sha256(7::text::bytea));
ROLLBACK TO s1;
INSERT INTO test_tab VALUES (8, sha256(8::text::bytea));
SAVEPOINT s4;
INSERT INTO test_tab VALUES (9, sha256(9::text::bytea));
SAVEPOINT s5;
INSERT INTO test_tab VALUES (10, sha256(10::text::bytea));
COMMIT;
});
my $result =
$node_subscriber->safe_psql('postgres', "SELECT count(*), count(c) FROM test_tab");
is($result, qq(6|0), 'check rollback to savepoint was reflected on subscriber and extra columns contain local defaults'
);
# Check the subscriber log from now on.
$offset = -s $node_subscriber->logfile;
# streamed transaction with subscriber receiving out of order # subtransaction ROLLBACKs
$node_publisher->safe_psql( 'postgres', q{
BEGIN;
INSERT INTO test_tab VALUES (11, sha256(11::text::bytea));
SAVEPOINT s1;
INSERT INTO test_tab VALUES (12, sha256(12::text::bytea));
SAVEPOINT s2;
INSERT INTO test_tab VALUES (13, sha256(13::text::bytea));
SAVEPOINT s3;
INSERT INTO test_tab VALUES (14, sha256(14::text::bytea));
RELEASE s2;
INSERT INTO test_tab VALUES (15, sha256(15::text::bytea));
ROLLBACK TO s1;
COMMIT;
});
$result =
$node_subscriber->safe_psql('postgres', "SELECT count(*), count(c) FROM test_tab");
is($result, qq(7|0), 'check rollback to savepoint was reflected on subscriber');
# Check the subscriber log from now on.
$offset = -s $node_subscriber->logfile;
# streamed transaction with subscriber receiving rollback
$node_publisher->safe_psql( 'postgres', q{
BEGIN;
INSERT INTO test_tab VALUES (16, sha256(16::text::bytea));
SAVEPOINT s1;
INSERT INTO test_tab VALUES (17, sha256(17::text::bytea));
SAVEPOINT s2;
INSERT INTO test_tab VALUES (18, sha256(18::text::bytea));
ROLLBACK;
});
# Create subscriber node
my $node_subscriber = PostgreSQL::Test::Cluster->new('subscriber');
$node_subscriber->init;
$node_subscriber->start;
# Create some preexisting content on publisher
$node_publisher->safe_psql('postgres', "CREATE TABLE test_tab (a int primary key, b bytea)");
$node_publisher->safe_psql('postgres', "INSERT INTO test_tab VALUES (1, 'foo'), (2, 'bar')");
$node_publisher->safe_psql('postgres', "CREATE TABLE test_tab_2 (a int)");
# Setup structure on subscriber
$node_subscriber->safe_psql('postgres', "CREATE TABLE test_tab (a int primary key, b text, c INT, d INT, e INT)");
$node_subscriber->safe_psql('postgres', "CREATE TABLE test_tab_2 (a int)");
# Setup logical replication
my $publisher_connstr = $node_publisher->connstr . ' dbname=postgres';
$node_publisher->safe_psql('postgres', "CREATE PUBLICATION tap_pub FOR TABLE test_tab, test_tab_2");
my $appname = 'tap_sub';
################################ # Test using streaming mode 'on' ################################
$node_subscriber->safe_psql('postgres', "CREATE SUBSCRIPTION tap_sub CONNECTION '$publisher_connstr application_name=$appname' PUBLICATION tap_pub WITH (streaming = on)"
);
# Wait for initial table sync to finish
$node_subscriber->wait_for_subscription_sync($node_publisher, $appname);
my $result =
$node_subscriber->safe_psql('postgres', "SELECT count(*), count(c) FROM test_tab");
is($result, qq(2|0), 'check initial data was copied to subscriber');
###################################### # Test using streaming mode 'parallel' ######################################
my $oldpid = $node_publisher->safe_psql('postgres', "SELECT pid FROM pg_stat_replication WHERE application_name = '$appname' AND state = 'streaming';"
);
$node_publisher->poll_query_until('postgres', "SELECT pid != $oldpid FROM pg_stat_replication WHERE application_name = '$appname' AND state = 'streaming';"
)
or die "Timed out while waiting for apply to restart after changing SUBSCRIPTION";
# We need to check DEBUG logs to ensure that the parallel apply worker has # applied the transaction. So, bump up the log verbosity.
$node_subscriber->append_conf('postgresql.conf', "log_min_messages = debug1");
$node_subscriber->reload;
# Run a query to make sure that the reload has taken effect.
$node_subscriber->safe_psql('postgres', q{SELECT 1});
# Test serializing changes to files and notify the parallel apply worker to # apply them at the end of the transaction.
$node_subscriber->append_conf('postgresql.conf', 'debug_logical_replication_streaming = immediate'); # Reset the log_min_messages to default.
$node_subscriber->append_conf('postgresql.conf', "log_min_messages = warning");
$node_subscriber->reload;
# Run a query to make sure that the reload has taken effect.
$node_subscriber->safe_psql('postgres', q{SELECT 1});
my $offset = -s $node_subscriber->logfile;
$node_publisher->safe_psql( 'postgres', q{
BEGIN;
INSERT INTO test_tab_2 values(1);
ROLLBACK;
});
# Ensure that the changes are serialized.
$node_subscriber->wait_for_log(
qr/LOG: ( [A-Z0-9]+:)? logical replication apply worker will serialize the remaining changes of remote transaction \d+ to a file/,
$offset);
$node_publisher->wait_for_catchup($appname);
# Check that transaction is aborted on subscriber
$result =
$node_subscriber->safe_psql('postgres', "SELECT count(*) FROM test_tab_2");
is($result, qq(0), 'check rollback was reflected on subscriber');
# Serialize the ABORT sub-transaction.
$offset = -s $node_subscriber->logfile;
$node_publisher->safe_psql( 'postgres', q{
BEGIN;
INSERT INTO test_tab_2 values(1);
SAVEPOINT sp;
INSERT INTO test_tab_2 values(1);
ROLLBACK TO sp;
COMMIT;
});
# Ensure that the changes are serialized.
$node_subscriber->wait_for_log(
qr/LOG: ( [A-Z0-9]+:)? logical replication apply worker will serialize the remaining changes of remote transaction \d+ to a file/,
$offset);
$node_publisher->wait_for_catchup($appname);
# Check that only sub-transaction is aborted on subscriber.
$result =
$node_subscriber->safe_psql('postgres', "SELECT count(*) FROM test_tab_2");
is($result, qq(1), 'check rollback to savepoint was reflected on subscriber');
$node_subscriber->stop;
$node_publisher->stop;
done_testing();
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