diff options
Diffstat (limited to 'src/test/recovery/t/047_checkpoint_physical_slot.pl')
| -rw-r--r-- | src/test/recovery/t/047_checkpoint_physical_slot.pl | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/src/test/recovery/t/047_checkpoint_physical_slot.pl b/src/test/recovery/t/047_checkpoint_physical_slot.pl new file mode 100644 index 00000000000..9e98383e30e --- /dev/null +++ b/src/test/recovery/t/047_checkpoint_physical_slot.pl @@ -0,0 +1,133 @@ +# Copyright (c) 2025, PostgreSQL Global Development Group +# +# This test verifies the case when the physical slot is advanced during +# checkpoint. The test checks that the physical 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 = 'replica'"); +$node->start; + +# Check if the extension injection_points is available, as it may be +# possible that this script is run with installcheck, where the module +# would not be installed by default. +if (!$node->check_extension('injection_points')) +{ + plan skip_all => 'Extension injection_points not installed'; +} + +$node->safe_psql('postgres', q(CREATE EXTENSION injection_points)); + +# Create a physical replication slot. +$node->safe_psql('postgres', + q{select pg_create_physical_replication_slot('slot_physical', true)}); + +# Advance slot to the current position, just to have everything "valid". +$node->safe_psql('postgres', + q{select pg_replication_slot_advance('slot_physical', pg_current_wal_lsn())} +); + +# Run checkpoint to flush current state to disk and set a baseline. +$node->safe_psql('postgres', q{checkpoint}); + +# Insert 2M rows; that's about 260MB (~20 segments) worth of WAL. +$node->advance_wal(20); + +# Advance slot to the current position, just to have everything "valid". +$node->safe_psql('postgres', + q{select pg_replication_slot_advance('slot_physical', pg_current_wal_lsn())} +); + +# Run another checkpoint to set a new restore LSN. +$node->safe_psql('postgres', q{checkpoint}); + +# Another 2M rows; that's about 260MB (~20 segments) worth of WAL. +$node->advance_wal(20); + +my $restart_lsn_init = $node->safe_psql('postgres', + q{select restart_lsn from pg_replication_slots where slot_name = 'slot_physical'} +); +chomp($restart_lsn_init); +note("restart lsn before checkpoint: $restart_lsn_init"); + +# 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'); + +# 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 physical slot. +$node->safe_psql('postgres', + q{select pg_replication_slot_advance('slot_physical', pg_current_wal_lsn())} +); + +# 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); + +my $restart_lsn_old = $node->safe_psql('postgres', + q{select restart_lsn from pg_replication_slots where slot_name = 'slot_physical'} +); +chomp($restart_lsn_old); +note("restart lsn before stop: $restart_lsn_old"); + +# Abruptly stop the server. +$node->stop('immediate'); + +$node->start; + +# Get the restart_lsn of the slot right after restarting. +my $restart_lsn = $node->safe_psql('postgres', + q{select restart_lsn from pg_replication_slots where slot_name = 'slot_physical'} +); +chomp($restart_lsn); +note("restart lsn: $restart_lsn"); + +# Get the WAL segment name for the slot's restart_lsn. +my $restart_lsn_segment = $node->safe_psql('postgres', + "SELECT pg_walfile_name('$restart_lsn'::pg_lsn)"); +chomp($restart_lsn_segment); + +# Check if the required wal segment exists. +note("required by slot segment name: $restart_lsn_segment"); +my $datadir = $node->data_dir; +ok( -f "$datadir/pg_wal/$restart_lsn_segment", + "WAL segment $restart_lsn_segment for physical slot's restart_lsn $restart_lsn exists" +); + +done_testing(); |