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Re: Core team statement on replication in PostgreSQL

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: David Fetter <david(at)fetter(dot)org>
Cc: Josh Berkus <josh(at)agliodbs(dot)com>, Marko Kreen <markokr(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Core team statement on replication in PostgreSQL
Date: 2008-05-29 16:13:20
Message-ID: 200805291613.m4TGDKs19087@momjian.us (view raw or flat)
Thread:
Lists: pgsql-advocacypgsql-hackers
David Fetter wrote:
> On Thu, May 29, 2008 at 11:58:31AM -0400, Bruce Momjian wrote:
> > Josh Berkus wrote:
> > > Publishing the XIDs back to the master is one possibility.  We
> > > also looked at using "spillover segments" for vacuumed rows, but
> > > that seemed even less viable.
> > > 
> > > I'm also thinking, for *async replication*, that we could simply
> > > halt replication on the slave whenever a transaction passes minxid
> > > on the master.  However, the main focus will be on synchrounous
> > > hot standby.
> > 
> > Another idea I discussed with Tom is having the slave _delay_
> > applying WAL files until all slave snapshots are ready.
> 
> Either one of these would be great, but something that involves
> machines that stay useless most of the time is just not going to work.

Right, the ultimate target is to have the slave be read-only, but we
need to get the streaming of WAL logs done first.

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +

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