Apologies, I inadvertently sent the version before I added a maximum number of iterations in the final loop.
-- Álvaro Herrera Valdivia, Chile "La fuerza no está en los medios físicos sino que reside en una voluntad indomable" (Gandhi)
>From 1492e9468ecd86167a1253c4a2e9b31139835649 Mon Sep 17 00:00:00 2001 From: Alvaro Herrera <alvhe...@alvh.no-ip.org> Date: Thu, 10 Jun 2021 16:44:03 -0400 Subject: [PATCH v4] Add test case for obsoleting slot with active walsender MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The code to signal a running walsender when its reserved WAL size grows too large is completely uncovered before this commit; this adds coverage for that case. This test involves sending SIGSTOP to walsender and walreceiver and running a checkpoint while advancing WAL, then sending SIGCONT. There's no precedent for this coding in Perl tests, and my reading of relevant manpages says it's likely to fail on Windows. Because of this, this test is always skipped on that platform. Author: Álvaro Herrera <alvhe...@alvh.no-ip.org> Discussion: https://postgr.es/m/202106102202.mjw4huiix7lo@alvherre.pgsql --- src/test/recovery/t/019_replslot_limit.pl | 84 ++++++++++++++++++++++- 1 file changed, 81 insertions(+), 3 deletions(-) diff --git a/src/test/recovery/t/019_replslot_limit.pl b/src/test/recovery/t/019_replslot_limit.pl index 7094aa0704..52bc9f8cfd 100644 --- a/src/test/recovery/t/019_replslot_limit.pl +++ b/src/test/recovery/t/019_replslot_limit.pl @@ -11,7 +11,7 @@ use TestLib; use PostgresNode; use File::Path qw(rmtree); -use Test::More tests => 14; +use Test::More tests => $TestLib::windows_os ? 14 : 18; use Time::HiRes qw(usleep); $ENV{PGDATABASE} = 'postgres'; @@ -211,8 +211,8 @@ for (my $i = 0; $i < 10000; $i++) } ok($failed, 'check that replication has been broken'); -$node_primary->stop('immediate'); -$node_standby->stop('immediate'); +$node_primary->stop; +$node_standby->stop; my $node_primary2 = get_new_node('primary2'); $node_primary2->init(allows_streaming => 1); @@ -253,6 +253,84 @@ my @result = timeout => '60')); is($result[1], 'finished', 'check if checkpoint command is not blocked'); +$node_primary2->stop; +$node_standby->stop; + +# The next test depends on Perl's `kill`, which apparently is not +# portable to Windows. (It would be nice to use Test::More's `subtest`, +# but that's not in the ancient version we require.) +if ($TestLib::windows_os) +{ + done_testing(); + exit; +} + +# Get a slot terminated while the walsender is active +# We do this by sending SIGSTOP to the walsender. Skip this on Windows. +my $node_primary3 = get_new_node('primary3'); +$node_primary3->init(allows_streaming => 1, extra => ['--wal-segsize=1']); +$node_primary3->append_conf( + 'postgresql.conf', qq( + min_wal_size = 2MB + max_wal_size = 2MB + log_checkpoints = yes + max_slot_wal_keep_size = 1MB + )); +$node_primary3->start; +$node_primary3->safe_psql('postgres', + "SELECT pg_create_physical_replication_slot('rep3')"); +# Take backup +$backup_name = 'my_backup'; +$node_primary3->backup($backup_name); +# Create standby +my $node_standby3 = get_new_node('standby_3'); +$node_standby3->init_from_backup($node_primary3, $backup_name, + has_streaming => 1); +$node_standby3->append_conf('postgresql.conf', "primary_slot_name = 'rep3'"); +$node_standby3->start; +$node_primary3->wait_for_catchup($node_standby3->name, 'replay'); +my $senderpid = $node_primary3->safe_psql('postgres', + "SELECT pid FROM pg_stat_activity WHERE backend_type = 'walsender'"); +like($senderpid, qr/^[0-9]+$/, "have walsender pid $senderpid"); +my $receiverpid = $node_standby3->safe_psql('postgres', + "SELECT pid FROM pg_stat_activity WHERE backend_type = 'walreceiver'"); +like($receiverpid, qr/^[0-9]+$/, "have walreceiver pid $receiverpid"); + +# freeze walsender and walreceiver. Slot will still be active, but walreceiver +# won't get anything anymore. +kill 'STOP', $senderpid, $receiverpid; +$logstart = get_log_size($node_primary3); +advance_wal($node_primary3, 4); +ok(find_in_log($node_primary3, "to release replication slot", $logstart), + "walreceiver termination logged"); + +# Now let the walsender continue; slot should be killed now. +# (Must not let walreceiver run yet; otherwise the standby could start another +# one before the slot can be killed) +kill 'CONT', $senderpid; +$node_primary3->poll_query_until('postgres', + "SELECT wal_status FROM pg_replication_slots WHERE slot_name = 'rep3'", + "lost") + or die "timed out waiting for slot to be lost"; + +my $max_attempts = 180; +while ($max_attempts-- > 0) +{ + if (find_in_log($node_primary3, + 'invalidating slot "rep3" because its restart_lsn', $logstart)) + { + ok(1, "slot invalidation logged"); + last; + } + sleep 1; +} + +# Now let the walreceiver continue, so that the node can be stopped cleanly +kill 'CONT', $receiverpid; + +$node_primary3->stop; +$node_standby3->stop; + ##################################### # Advance WAL of $node by $n segments sub advance_wal -- 2.20.1
