From: Simon Riggs <simon@2ndQuadrant.com>
To: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: Hot Standby on git
Date: Fri, 02 Oct 2009 11:46:51 +0100
Message-ID: <1254480411.17864.368.camel@ebony.2ndQuadrant> (raw)
In-Reply-To: <4AC5B92A.7090508@enterprisedb.com>
References: <1253958559.4449.833.camel@ebony.2ndQuadrant>
<4AC2FBB9.7060304@enterprisedb.com>
<1254408330.17864.233.camel@ebony.2ndQuadrant>
<4AC4CF18.50309@enterprisedb.com>
<1254413624.17864.243.camel@ebony.2ndQuadrant>
<4AC5A60F.5050503@enterprisedb.com>
<1254468966.17864.301.camel@ebony.2ndQuadrant>
<4AC5AF36.3020900@enterprisedb.com>
<1254470874.17864.309.camel@ebony.2ndQuadrant>
<4AC5B92A.7090508@enterprisedb.com>
On Fri, 2009-10-02 at 11:26 +0300, Heikki Linnakangas wrote:
> Simon Riggs wrote:
> > On Fri, 2009-10-02 at 10:43 +0300, Heikki Linnakangas wrote:
> >
> >> It seems dangerous to write a WAL record after the shutdown checkpoint.
> >> It will be overwritten by subsequent startup, which is a recipe for trouble.
> >
> > I've said its a corner case and not worth spending time on. I'm putting
> > it in at your request. If it's not correct before and not correct after,
> > where exactly do you want it?
>
> I don't know. Perhaps it should go between the REDO pointer of the
> shutdown checkpoint and the checkpoint record itself. Or maybe the
> information should be included in the checkpoint record itself.
I've implemented this but it requires us to remove two checks - one at
shutdown and one at startup on a shutdown checkpoint. I'm not happy
doing that and would like to put them back.
I'd rather just skip this for now. It's a minor case anyway and there's
nothing stopping writing their own RunningXactData records with a
function, if it is needed. I can add a function for that.
--
Simon Riggs www.2ndQuadrant.com
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To: pgsql-hackers@postgresql.org
Cc: simon@2ndQuadrant.com, heikki.linnakangas@enterprisedb.com
Subject: Re: Hot Standby on git
In-Reply-To: <1254480411.17864.368.camel@ebony.2ndQuadrant>
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