Re: Simplifying replication

Greg,

> The way things stand you *always* need archived logs. Even if you have
> streaming set up it might try to use archived logs if it falls too far
> behind.

Actually, you don't. If you're willing to accept possible
desynchronization and recloning of the standbys, then you can skip the
archive logs.

> Timelines are not as obvious but perhaps that's our own mistake. When
> you fail over to your replica shouldn't the new master get a new
> timelineid? Isn't that the answer to the failure case when a slave
> finds it's ahead of the master? If it has already replayed logs from a
> different timelineid in the same lsn range then it can't switch
> timelines to follow the new master. But if it hasn't then it can.

Oh? Do we have this information (i.e. what LSNs are associated with
which timeline)?

--
-- Josh Berkus
PostgreSQL Experts Inc.
http://www.pgexperts.com