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Re: Replication direction

From: Ned Wolpert <ned(dot)wolpert(at)knowledgenet(dot)com>
To: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
Cc: PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org>
Subject: Re: Replication direction
Date: 2002-02-22 18:22:26
Message-ID: 1014402146.27807.16.camel@osti.knowledgenet.corp (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Fri, 2002-02-22 at 10:20, Bruce Momjian wrote: 
> As far as WAL, it currently has the tid's in the WAL file which will not
> match other servers unless those servers are read-only.  It is tempting
> to think that WAL or some other existing mechanism will allow us to do
> replication cheaply, but it is my understanding that the interactions of
> multiple write server is quite complicated and requires an amount of
> overhead mechanism that is similar to our current transaction mechanisms
> that allow multiple people to modify the same table.

Drat.  I was hoping that the WAL was an overlooked 'easy' solution...
but from the sound of this thread, the WAL misses some key issues.  And
it doesn't help the master-master environment at all, which I forgot. 
Ah well...
> People know I am all for the quick solution if it fits into our existing
> code, but I am afraid replication is one of those items that has to be
> designed from the ground up on a foundation that is backed by research
> and experts in the field.  I think this replication project has the
> potential to give us a replication capability that is better than
> the commercial offering of other databases.


Ned Wolpert <ned(dot)wolpert(at)knowledgenet(dot)com>

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