| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Boszormenyi Zoltan <zb(at)cybertec(dot)at> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Hans-Juergen Schoenig <hs(at)cybertec(dot)at> |
| Subject: | Re: WIP partial replication patch |
| Date: | 2010-08-13 19:42:28 |
| Message-ID: | 20100813194227.GA2856@anarazel.de |
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| Lists: | pgsql-hackers |
On Fri, Aug 13, 2010 at 09:36:00PM +0200, Boszormenyi Zoltan wrote:
> Tom Lane írta:
> > Boszormenyi Zoltan <zb(at)cybertec(dot)at> writes:
> >
> >> attached is a WIP patch that will eventually implement
> >> partial replication, with the following syntax:
> > This fundamentally cannot work, as it relies on system catalogs to be
> > valid during recovery.
> Just like Hot Standby, no? What is the difference here?
> Sorry for being ignorant.
In HS you can only connect after youve found a restartpoint - only
after that you know that you have reached a consistent point for the
system.
I think this is fixable by keeping more wal on the standby's but I
need to think more about it.
Andres
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