| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Streaming replication, and walsender during recovery |
| Date: | 2010-01-28 18:58:19 |
| Message-ID: | 1264705099.24669.11475.camel@ebony |
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| Lists: | pgsql-hackers |
On Thu, 2010-01-28 at 20:49 +0200, Heikki Linnakangas wrote:
> Simon Riggs wrote:
> > I'm a little worried the feature set of streaming rep isn't any better
> > than what we have already.
>
> Huh? Are you thinking of the "Record-based Log Shipping" described in
> the manual, using a program to poll pg_xlogfile_name_offset() in a tight
> loop, as a replacement for streaming replication? First of all, that
> requires a big chunk of custom development, so it's a bit of a stretch
> to say we have it already.
It's been part of Skytools for years now...
> Secondly, with that method, the standby still
> still be replaying the WAL one file at a time, which makes a difference
> with Hot Standby.
I'm not attempting to diss Streaming Rep, or anyone involved. What has
been done is good internal work. I am pointing out and requesting that
we should have a little more added before we stop for this release.
--
Simon Riggs www.2ndQuadrant.com
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