On 03.10.2012 18:15, Amit Kapila wrote:
On Tuesday, October 02, 2012 4:21 PM Heikki Linnakangas wrote:
Hmm, should a base backup be aborted when the standby is promoted? Does
the promotion render the backup corrupt?
I think currently it does so. Pls refer
1.
do_pg_stop_backup(char *labelfile, bool waitforarchive)
{
..
if (strcmp(backupfrom, "standby") == 0&& !backup_started_in_recovery)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("the standby was promoted during
online backup"),
errhint("This means that the backup being
taken is corrupt "
"and should not be used. "
"Try taking another online
backup.")));
..
}
Okay. I think that check in do_pg_stop_backup() actually already ensures
that you don't end up with a corrupt backup, even if the standby is
promoted while a backup is being taken. Admittedly it would be nicer to
abort it immediately rather than error out at the end.
But I wonder why promoting a standby renders the backup invalid in the
first place? Fujii, Simon, can you explain that?
- Heikki
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