
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