On 03/19/2014 10:28 AM, Kyotaro HORIGUCHI wrote:
The*problematic* operation sequence I saw was performed by pgsql-RA/Pacemaker. It stops a server already with immediate mode and starts the Master as a Standby at first, then promote. Focusing on this situation, there would be reasonable to reset backup positions.
Well, that's scary. I would suggest doing a fast shutdown instead. But if you really want to do an immediate shutdown, you should delete the backup_label file after the shutdown
When restarting after immediate shutdown and a backup_label file is present, the system doesn't know if the system crashed during a backup, and it needs to perform crash recovery, or if you're trying restore from a backup. It makes a compromise, and starts recovery from the checkpoint given in the backup_label, as if it was restoring from a backup, but if it doesn't see a backup-end WAL record, it just starts up anyway (which would be wrong if you are indeed restoring from a backup). But if you create a recovery.conf file, that indicates that you are definitely restoring from a backup, so it's more strict and insists that the backup-end record must be replayed.
9.4 canceles backup mode even on immediate shutdown so the operation causes no problem, but 9.3 and before are doesn't.
Hmm, I don't think we've changed that behavior in 9.4. - Heikki -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
