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Re: Core team statement on replication in PostgreSQL

From: "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com>
To: "Csaba Nagy" <nagy(at)ecircle-ag(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 11:17:55
Message-ID: 484679E3.2040202@enterprisedb.com (view raw or flat)
Thread:
Lists: pgsql-advocacypgsql-hackers
Csaba Nagy wrote:
> 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...

These are already covered by the information in pg_control.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com

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