From 4584664c18bb63a604c6d20eb22831ec6e59a49a Mon Sep 17 00:00:00 2001 From: Michael Paquier Date: Tue, 15 Jul 2025 12:07:50 +0900 Subject: [PATCH v4 3/3] Reintroduce test 046_checkpoint_logical_slot This patch is only for HEAD and v18 where the test has been removed, improvements to the checkpoint completion wait and the extra pg_logical_emit_message() call to force the creation of a WAL record that spawns through at least 2 pages needs to be backpatched down to v17 to improve the stability and coverage of the original test. Author: Alexander Korotkov Co-authored-by: Hayato Kuroda --- src/test/recovery/meson.build | 1 + .../recovery/t/046_checkpoint_logical_slot.pl | 142 ++++++++++++++++++ 2 files changed, 143 insertions(+) create mode 100644 src/test/recovery/t/046_checkpoint_logical_slot.pl diff --git a/src/test/recovery/meson.build b/src/test/recovery/meson.build index 6e78ff1a030b..52993c32dbba 100644 --- a/src/test/recovery/meson.build +++ b/src/test/recovery/meson.build @@ -54,6 +54,7 @@ tests += { 't/043_no_contrecord_switch.pl', 't/044_invalidate_inactive_slots.pl', 't/045_archive_restartpoint.pl', + 't/046_checkpoint_logical_slot.pl', 't/047_checkpoint_physical_slot.pl', 't/048_vacuum_horizon_floor.pl' ], diff --git a/src/test/recovery/t/046_checkpoint_logical_slot.pl b/src/test/recovery/t/046_checkpoint_logical_slot.pl new file mode 100644 index 000000000000..bdfca3ddf826 --- /dev/null +++ b/src/test/recovery/t/046_checkpoint_logical_slot.pl @@ -0,0 +1,142 @@ +# Copyright (c) 2025, PostgreSQL Global Development Group +# +# This test verifies the case when the logical slot is advanced during +# checkpoint. The test checks that the logical slot's restart_lsn still refers +# to an existed WAL segment after immediate restart. + +use strict; +use warnings FATAL => 'all'; + +use PostgreSQL::Test::Cluster; +use PostgreSQL::Test::Utils; + +use Test::More; + +if ($ENV{enable_injection_points} ne 'yes') +{ + plan skip_all => 'Injection points not supported by this build'; +} + +my ($node, $result); + +$node = PostgreSQL::Test::Cluster->new('mike'); +$node->init; +$node->append_conf('postgresql.conf', "wal_level = 'logical'"); +$node->start; + +# Check if the extension injection_points is available, as it may be +# possible that this script is run with installcheck, where the module +# would not be installed by default. +if (!$node->check_extension('injection_points')) +{ + plan skip_all => 'Extension injection_points not installed'; +} + +$node->safe_psql('postgres', q(CREATE EXTENSION injection_points)); + +# Create the two slots we'll need. +$node->safe_psql('postgres', + q{select pg_create_logical_replication_slot('slot_logical', 'test_decoding')} +); +$node->safe_psql('postgres', + q{select pg_create_physical_replication_slot('slot_physical', true)}); + +# Advance both slots to the current position just to have everything "valid". +$node->safe_psql('postgres', + q{select count(*) from pg_logical_slot_get_changes('slot_logical', null, null)} +); +$node->safe_psql('postgres', + q{select pg_replication_slot_advance('slot_physical', pg_current_wal_lsn())} +); + +# Run checkpoint to flush current state to disk and set a baseline. +$node->safe_psql('postgres', q{checkpoint}); + +# Generate some transactions to get RUNNING_XACTS. +my $xacts = $node->background_psql('postgres'); +$xacts->query_until( + qr/run_xacts/, + q(\echo run_xacts +SELECT 1 \watch 0.1 +\q +)); + +$node->advance_wal(20); + +# Run another checkpoint to set a new restore LSN. +$node->safe_psql('postgres', q{checkpoint}); + +$node->advance_wal(20); + +# Run another checkpoint, this time in the background, and make it wait +# on the injection point) so that the checkpoint stops right before +# removing old WAL segments. +note('starting checkpoint'); + +my $checkpoint = $node->background_psql('postgres'); +$checkpoint->query_safe( + q(select injection_points_attach('checkpoint-before-old-wal-removal','wait')) +); +$checkpoint->query_until( + qr/starting_checkpoint/, + q(\echo starting_checkpoint +checkpoint; +\q +)); + +# Wait until the checkpoint stops right before removing WAL segments. +note('waiting for injection_point'); +$node->wait_for_event('checkpointer', 'checkpoint-before-old-wal-removal'); +note('injection_point is reached'); + +# Try to advance the logical slot, but make it stop when it moves to the next +# WAL segment (this has to happen in the background, too). +my $logical = $node->background_psql('postgres'); +$logical->query_safe( + q{select injection_points_attach('logical-replication-slot-advance-segment','wait');} +); +$logical->query_until( + qr/get_changes/, + q( +\echo get_changes +select count(*) from pg_logical_slot_get_changes('slot_logical', null, null) \watch 1 +\q +)); + +# Wait until the slot's restart_lsn points to the next WAL segment. +note('waiting for injection_point'); +$node->wait_for_event('client backend', + 'logical-replication-slot-advance-segment'); +note('injection_point is reached'); + +# OK, we're in the right situation: time to advance the physical slot, which +# recalculates the required LSN, and then unblock the checkpoint, which +# removes the WAL still needed by the logical slot. +$node->safe_psql('postgres', + q{select pg_replication_slot_advance('slot_physical', pg_current_wal_lsn())} +); + +# Generate a long WAL record, spawning at least two pages for the follow-up +# post-recovery check. +$node->safe_psql('postgres', + q{select pg_logical_emit_message(false, '', repeat('123456789', 1000))}); + +# Continue the checkpoint and wait for its completion. +my $log_offset = -s $node->logfile; +$node->safe_psql('postgres', + q{select injection_points_wakeup('checkpoint-before-old-wal-removal')}); +$node->wait_for_log(qr/checkpoint complete/, $log_offset); + +# Abruptly stop the server. +$node->stop('immediate'); + +$node->start; + +eval { + $node->safe_psql('postgres', + q{select count(*) from pg_logical_slot_get_changes('slot_logical', null, null);} + ); +}; +is($@, '', "Logical slot still valid"); + +done_testing(); -- 2.50.0