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Test pg_stat_statements across crash restart

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Add 'pg_stat_statements' to the crash restart test, to test that
shared memory and LWLock initialization works across crash restart in
a library listed in shared_preload_libraries. We had no test coverage
for that.

Reviewed-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Discussion: https://www.postgresql.org/message-id/CAExHW5vM1bneLYfg0wGeAa=52UiJ3z4vKd3AJ72X8Fw6k3KKrg@mail.gmail.com
This commit is contained in:
Heikki Linnakangas 2026-04-02 13:33:06 +03:00
parent 4441d6b2e4
commit 148fe2b05d
1 changed files with 29 additions and 4 deletions
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33
src/test/recovery/t/013_crash_restart.pl
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@ -21,14 +21,32 @@ my $psql_timeout = IPC::Run::timer($PostgreSQL::Test::Utils::timeout_default);
my $node = PostgreSQL::Test::Cluster->new('primary');
$node->init(allows_streaming => 1);
# Enable pg_stat_statements to test restart of shared_preload_libraries.
$node->append_conf(
'postgresql.conf',
qq{shared_preload_libraries = 'pg_stat_statements'
pg_stat_statements.max = 50000
compute_query_id = 'regress'
});
$node->start();
# by default PostgreSQL::Test::Cluster doesn't restart after a crash
$node->safe_psql(
'postgres',
q[ALTER SYSTEM SET restart_after_crash = 1;
ALTER SYSTEM SET log_connections = receipt;
SELECT pg_reload_conf();]);
'postgres', q[
ALTER SYSTEM SET restart_after_crash = 1;
ALTER SYSTEM SET log_connections = receipt;
SELECT pg_reload_conf();
]);
# Remember the time that pg_stat_statements was reset. We'll use it later to
# verify that it gets re-initialized after crash.
my $stats_reset = $node->safe_psql(
'postgres', q[
CREATE EXTENSION pg_stat_statements;
SELECT stats_reset FROM pg_stat_statements_info;
]);
# Run psql, keeping session alive, so we have an alive backend to kill.
my ($killme_stdin, $killme_stdout, $killme_stderr) = ('', '', '');
@ -141,6 +159,13 @@ $killme->run();
($monitor_stdin, $monitor_stdout, $monitor_stderr) = ('', '', '');
$monitor->run();
# Verify that pg_stat_statements, loaded via shared_preload_libraries,
# was re-initialized at the crash.
my $stats_reset_after = $node->safe_psql('postgres',
q[SELECT stats_reset FROM pg_stat_statements_info]);
cmp_ok($stats_reset, 'ne', $stats_reset_after,
"pg_stat_statements was reset by restart");
# Acquire pid of new backend
$killme_stdin .= q[