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Stabilize 019_replslot_limit

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The test assumed that advancing WAL would lead to a checkpoint that
invalidates the obsolete replication slot.  If a checkpoint that started
before the WAL switch completes first, the following checkpoint can be
skipped as idle, so the expected walsender termination is not logged.

Force a CHECKPOINT in a background psql session after advancing WAL, so
the slot invalidation is exercised deterministically.

This has been observed on buildfarm members alligator and partridge:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=alligator&dt=2024-12-13%2001%3A24%3A58
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=partridge&dt=2026-08-06%2018%3A00%3A11

Backpatch to all supported versions.

Reported-by: Alexander Lakhin <exclusion@gmail.com>
Author: Hayato Kuroda <kuroda.hayato@fujitsu.com>
Reviewed-by: Alexander Lakhin <exclusion@gmail.com>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/0b07ead5-a5da-445e-9698-a7d340708bdf@gmail.com
Backpatch-through: 14
This commit is contained in:
Fujii Masao
2026-08-27 23:57:47 +09:00
parent ba2ea49b3c
commit 321ec8ee1c
1 changed files with 11 additions and 2 deletions
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13
src/test/recovery/t/019_replslot_limit.pl
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@@ -314,8 +314,6 @@ 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
));
@@ -345,6 +343,16 @@ $logstart = get_log_size($node_primary3);
kill 'STOP', $senderpid, $receiverpid;
advance_wal($node_primary3, 2);
# Run CHECKPOINT in the background. It is expected to reach slot
# invalidation, signal the stopped walsender, and then wait until the
# walsender releases the slot.
my $checkpoint = $node_primary3->background_psql('postgres');
$checkpoint->query_until(
qr/starting_checkpoint/, q(
\echo starting_checkpoint
CHECKPOINT;
));
my $max_attempts = $TestLib::timeout_default;
while ($max_attempts-- >= 0)
{
@@ -366,6 +374,7 @@ $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";
$checkpoint->quit;
$max_attempts = $TestLib::timeout_default;
while ($max_attempts-- >= 0)