- master A is at position X
- master B, replicating from A, gets to position X
- master A syncs to its filesystem that it's at position X
- master A receives some inserts, and is now at position Y
- master B, replicating from A, gets to position Y
- master A crashes before the position gets synced to filesystem
- master A gets rebooted, recovers from innodb log, but has itself
only marked at position X
- master B requests position Y from master A, but that position
doesn't exist yet, so replication breaks.
Perhaps someone here knows the proper recovery procedure at this
point?
If this were master-slave, I'd probably do an LVM Snapshot and get a
fresh copy of the master db. The same could be done for
master-master.
I'm not sure this would work, since some data will have been inserted
in on master B as well. I.e., with master-master, a one-way sync won't
work. The only recovery option that I can see is to destroy Master A,
and copy Master B -- either via an LVM snapshot or shutdown, sync,
startup -- to create a new Master A. Maybe this is what you're
suggesting?
Is there a better way?
best,
Jeff
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