Horton

Adjust pg_wal_replay_wait() procedure behavior on promoted standby

Alexander Korotkov <akorotkov@postgresql.org>

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Commit: 867d396ccd2a7f0ce55e1fa7ebda00bc8c81147b
Author: Alexander Korotkov <akorotkov@postgresql.org>
Date: 2024-08-10T18:43:02Z
Releases: 18.0 
Adjust pg_wal_replay_wait() procedure behavior on promoted standby

pg_wal_replay_wait() is intended to be called on standby.  However, standby
can be promoted to primary at any moment, even concurrently with the
pg_wal_replay_wait() call.  If recovery is not currently in progress
that doesn't mean the wait was unsuccessful.  Thus, we always need to recheck
if the target LSN is replayed.

Reported-by: Kevin Hale Boyes
Discussion: https://postgr.es/m/CAPpHfdu5QN%2BZGACS%2B7foxmr8_nekgA2PA%2B-G3BuOUrdBLBFb6Q%40mail.gmail.com
Author: Alexander Korotkov

Files

PathChange+/−
doc/src/sgml/func.sgml modified +9 −0
src/backend/commands/waitlsn.c modified +33 −9
src/test/recovery/t/043_wal_replay_wait.pl modified +13 −2

Documentation touched

Discussion