We have setup active-passive cluster using streaming replication on Rhe 7.5. We are testing pacemaker for automated failover. We are seeing below issues with the setup :
1. When a failoveris triggered when data is being added to the primary by killing primary (killall -9 postgres), the standby doesnt come up in sync. On pacemaker, the crm_mon -Afr shows standby in disconnected and HS:alone state.
On postgres, we see below error:
< 2019-09-20 17:07:46.266 IST > LOG: entering standby mode < 2019-09-20 17:07:46.267 IST > LOG: database system was not properly shut down; automatic recovery in progress < 2019-09-20 17:07:46.270 IST > LOG: redo starts at 1/680A2188 < 2019-09-20 17:07:46.370 IST > LOG: consistent recovery state reached at 1/6879D9F8 < 2019-09-20 17:07:46.370 IST > LOG: database system is ready to accept read only connections cp: cannot stat '/var/lib/pgsql/9.6/data/archivedir/000000010000000100000068': No such file or directory < 2019-09-20 17:07:46.751 IST > LOG: statement: select pg_is_in_recovery() < 2019-09-20 17:07:46.782 IST > LOG: statement: show synchronous_standby_names < 2019-09-20 17:07:50.993 IST > LOG: statement: select pg_is_in_recovery() < 2019-09-20 17:07:53.395 IST > LOG: started streaming WAL from primary at 1/68000000 on timeline 1 < 2019-09-20 17:07:53.436 IST > LOG: invalid contrecord length 2662 at 1/6879D9F8 < 2019-09-20 17:07:53.438 IST > FATAL: terminating walreceiver process due to administrator command cp: cannot stat '/var/lib/pgsql/9.6/data/archivedir/00000002.history': No such file or directory cp: cannot stat '/var/lib/pgsql/9.6/data/archivedir/000000010000000100000068': No such file or directory
When we try to restart postgres on the standby, using pg_ctl restart, the standby start syncing.
2. After standby syncs using pg_ctl restart as mentioned above, we found out that 1-2 records are missing on the standby.
Need help to check: 1. why the standby fails to start in the first place and complains about missing logs? 2. can record mismatch be a problem related to failover not successful?
If you have faced this issue/have knowledge, please let us know.
replication is async. recovery.conf file has restore_command that uses cp
