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Re: Core team statement on replication in PostgreSQL

From: Hannu Krosing <hannu(at)krosing(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Heikki Linnakangas <heikki(at)enterprisedb(dot)com>,Stephen Denne <Stephen(dot)Denne(at)datamail(dot)co(dot)nz>,pgsql-hackers(at)postgresql(dot)org
Subject: Re: Core team statement on replication in PostgreSQL
Date: 2008-06-04 15:27:04
Message-ID: 1212593224.7526.1.camel@huvostro (view raw or flat)
Thread:
Lists: pgsql-advocacypgsql-hackers
On Wed, 2008-06-04 at 10:40 -0400, Tom Lane wrote:
> "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com> writes:
> > Hmm, WAL version compatibility is an interesting question. Most minor 
> > releases hasn't changed the WAL format, and it would be nice to allow 
> > running different minor versions in the master and slave in those cases. 
> > But it's certainly not unheard of to change the WAL format. Perhaps we 
> > should introduce a WAL version number, similar to catalog version?
> 
> Yeah, perhaps.  In the past we've changed the WAL page ID field for
> this; I'm not sure if that's enough or not.  It does seem like a good
> idea to have a way to check that the slaves aren't trying to read a
> WAL version they don't understand.  Also, it's possible that the WAL
> format doesn't change across a major update, but you still couldn't
> work with say an 8.4 master and an 8.3 slave, so maybe we need the
> catalog version ID in there too.

And something dependent on datetime being integer.

We probably won't need to encode presence of user defined types, like
PostGis , being present ?

-----
Hannu



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