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Re: Core team statement on replication in PostgreSQL

From: Csaba Nagy <nagy(at)ecircle-ag(dot)com>
To: Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
Cc: Stephen Denne <Stephen(dot)Denne(at)datamail(dot)co(dot)nz>, Hannu Krosing <hannu(at)krosing(dot)net>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Core team statement on replication in PostgreSQL
Date: 2008-06-04 10:58:53
Message-ID: 1212577133.8543.7.camel@PCD12478 (view raw or flat)
Thread:
Lists: pgsql-advocacypgsql-hackers
On Wed, 2008-06-04 at 11:13 +0300, Heikki Linnakangas wrote:
> 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?

Would that also cover possible differences in page size, 32bit OS vs.
64bit OS, different timestamp flavour, etc. issues ? AFAIR, all these
things can have an influence on how the data is written and possibly
make the WAL incompatible with other postgres instances, even if the
exact same version...

Cheers,
Csaba.



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