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Fix BF introduced in commit ddd5f4f54a.

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The failure is that the remote slot is not synchronized after the same
slot on standby gets invalidated. The reason was that remote_slot's
restart_lsn was lagged behind the standby's oldest WAL segment. The test
didn't ensure that remote_slot's LSN was advanced to the latest position
before we tried to sync the slots via new the function
pg_sync_replication_slots().

Discussion: https://postgr.es/m/CAA4eK1JLBi3HzenB6do3_hd78kN0UDD1mz-vumWE52XHHEq5Bw@mail.gmail.com
This commit is contained in:
Amit Kapila 2024-02-14 16:16:08 +05:30
parent b8f9e77725
commit bd8fc1677b
1 changed files with 9 additions and 2 deletions
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11
src/test/recovery/t/040_standby_failover_slots_sync.pl
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@ -171,7 +171,7 @@ $standby1->safe_psql('postgres', "SELECT pg_sync_replication_slots();");
# flagged as 'synced'
is( $standby1->safe_psql(
'postgres',
q{SELECT count(*) = 2 FROM pg_replication_slots WHERE slot_name IN ('lsub1_slot', 'lsub2_slot') AND synced;}
q{SELECT count(*) = 2 FROM pg_replication_slots WHERE slot_name IN ('lsub1_slot', 'lsub2_slot') AND synced AND NOT temporary;}
),
"t",
'logical slots have synced as true on standby');
@ -227,6 +227,13 @@ $standby1->reload;
$subscriber1->safe_psql('postgres',
"ALTER SUBSCRIPTION regress_mysub1 ENABLE");
# This wait ensures that confirmed_flush_lsn has been moved to latest
# position.
$primary->wait_for_catchup('regress_mysub1');
# To ensure that restart_lsn has moved to a recent WAL position, we need
# to log XLOG_RUNNING_XACTS and make sure the same is processed as well
$primary->psql('postgres', "CHECKPOINT");
$primary->wait_for_catchup('regress_mysub1');
# Do not allow any further advancement of the restart_lsn for the lsub1_slot.
@ -256,7 +263,7 @@ $standby1->wait_for_log(qr/dropped replication slot "lsub1_slot" of dbid [0-9]+/
# flagged as 'synced'
is( $standby1->safe_psql(
'postgres',
q{SELECT conflict_reason IS NULL AND synced FROM pg_replication_slots WHERE slot_name = 'lsub1_slot';}
q{SELECT conflict_reason IS NULL AND synced AND NOT temporary FROM pg_replication_slots WHERE slot_name = 'lsub1_slot';}
),
"t",
'logical slot is re-synced');