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b3b4d8e68a
The five modules in our TAP test framework all had names in the top level namespace. This is unwise because, even though we're not exporting them to CPAN, the names can leak, for example if they are exported by the RPM build process. We therefore move the modules to the PostgreSQL::Test namespace. In the process PostgresNode is renamed to Cluster, and TestLib is renamed to Utils. PostgresVersion becomes simply PostgreSQL::Version, to avoid possible confusion about what it's the version of. Discussion: https://postgr.es/m/aede93a4-7d92-ef26-398f-5094944c2504@dunslane.net Reviewed by Erik Rijkers and Michael Paquier
121 lines
3.8 KiB
Perl
121 lines
3.8 KiB
Perl
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# Copyright (c) 2021, PostgreSQL Global Development Group
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# Test replication statistics data in pg_stat_replication_slots is sane after
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# drop replication slot and restart.
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use strict;
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use warnings;
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use File::Path qw(rmtree);
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use PostgreSQL::Test::Cluster;
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use PostgreSQL::Test::Utils;
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use Test::More tests => 2;
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# Test set-up
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my $node = PostgreSQL::Test::Cluster->new('test');
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$node->init(allows_streaming => 'logical');
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$node->append_conf('postgresql.conf', 'synchronous_commit = on');
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$node->start;
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# Check that replication slot stats are expected.
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sub test_slot_stats
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{
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local $Test::Builder::Level = $Test::Builder::Level + 1;
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my ($node, $expected, $msg) = @_;
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my $result = $node->safe_psql(
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'postgres', qq[
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SELECT slot_name, total_txns > 0 AS total_txn,
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total_bytes > 0 AS total_bytes
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FROM pg_stat_replication_slots
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ORDER BY slot_name]);
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is($result, $expected, $msg);
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}
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# Create table.
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$node->safe_psql('postgres', "CREATE TABLE test_repl_stat(col1 int)");
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# Create replication slots.
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$node->safe_psql(
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'postgres', qq[
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SELECT pg_create_logical_replication_slot('regression_slot1', 'test_decoding');
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SELECT pg_create_logical_replication_slot('regression_slot2', 'test_decoding');
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SELECT pg_create_logical_replication_slot('regression_slot3', 'test_decoding');
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SELECT pg_create_logical_replication_slot('regression_slot4', 'test_decoding');
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]);
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# Insert some data.
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$node->safe_psql('postgres',
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"INSERT INTO test_repl_stat values(generate_series(1, 5));");
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$node->safe_psql(
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'postgres', qq[
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SELECT data FROM pg_logical_slot_get_changes('regression_slot1', NULL,
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NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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SELECT data FROM pg_logical_slot_get_changes('regression_slot2', NULL,
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NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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SELECT data FROM pg_logical_slot_get_changes('regression_slot3', NULL,
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NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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SELECT data FROM pg_logical_slot_get_changes('regression_slot4', NULL,
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NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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]);
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# Wait for the statistics to be updated.
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$node->poll_query_until(
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'postgres', qq[
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SELECT count(slot_name) >= 4 FROM pg_stat_replication_slots
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WHERE slot_name ~ 'regression_slot'
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AND total_txns > 0 AND total_bytes > 0;
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]) or die "Timed out while waiting for statistics to be updated";
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# Test to drop one of the replication slot and verify replication statistics data is
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# fine after restart.
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$node->safe_psql('postgres',
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"SELECT pg_drop_replication_slot('regression_slot4')");
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$node->stop;
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$node->start;
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# Verify statistics data present in pg_stat_replication_slots are sane after
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# restart.
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test_slot_stats(
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$node,
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qq(regression_slot1|t|t
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regression_slot2|t|t
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regression_slot3|t|t),
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'check replication statistics are updated');
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# Test to remove one of the replication slots and adjust
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# max_replication_slots accordingly to the number of slots. This leads
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# to a mismatch between the number of slots present in the stats file and the
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# number of stats present in the shared memory, simulating the scenario for
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# drop slot message lost by the statistics collector process. We verify
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# replication statistics data is fine after restart.
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$node->stop;
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my $datadir = $node->data_dir;
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my $slot3_replslotdir = "$datadir/pg_replslot/regression_slot3";
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rmtree($slot3_replslotdir);
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$node->append_conf('postgresql.conf', 'max_replication_slots = 2');
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$node->start;
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# Verify statistics data present in pg_stat_replication_slots are sane after
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# restart.
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test_slot_stats(
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$node,
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qq(regression_slot1|t|t
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regression_slot2|t|t),
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'check replication statistics after removing the slot file');
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# cleanup
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$node->safe_psql('postgres', "DROP TABLE test_repl_stat");
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$node->safe_psql('postgres',
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"SELECT pg_drop_replication_slot('regression_slot1')");
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$node->safe_psql('postgres',
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"SELECT pg_drop_replication_slot('regression_slot2')");
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# shutdown
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$node->stop;
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