| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
| Cc: | Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl>, Hans-Jürgen Schönig <postgres(at)cybertec(dot)at>, pgsql-hackers(at)postgresql(dot)org, eg(at)cybertec(dot)at |
| Subject: | Re: Constant WAL replay |
| Date: | 2005-04-24 22:48:04 |
| Message-ID: | 200504242248.j3OMm4602985@candle.pha.pa.us |
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| Lists: | pgsql-hackers pgsql-patches |
Joshua D. Drake wrote:
> Alvaro Herrera wrote:
> > On Sun, Apr 24, 2005 at 08:10:34AM +0200, Hans-J?rgen Sch?nig wrote:
> >
> >
> >>The idea: We are looking for a way to implement a synchronous
> >>single-master / multiple slaves systems.
> >>Meanwhile we are able to serialize / deserialize WAL records and send
> >>them to a group communication system which transports those records to
> >>the slave database.
> >>This is not hard to do.
> >
> >
> > In fact, I believe Command Prompt's Mammoth Replicator does exactly
> > this.
>
> Very close. We don't use the WAL (yet, slated for probably 8.1) but we
> do use a transaction log shipping method. So the implementation is
> almost the same.
Can you run queries on the slave? If so, how do you handle xid collisions?
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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