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Re: Clean shutdown and warm standby

From: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
To: Simon Riggs <simon(at)2ndQuadrant(dot)com>
Cc: Guillaume Smet <guillaume(dot)smet(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andreas Pflug <pgadmin(at)pse-consulting(dot)de>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Clean shutdown and warm standby
Date: 2009-05-28 13:19:33
Message-ID: 4A1E8F65.4030807@enterprisedb.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Simon Riggs wrote:
> On Thu, 2009-05-28 at 14:04 +0300, Heikki Linnakangas wrote:
> 
>> I've committed a patch to do the RequstXLogSwitch() before shutdown 
>> checkpoint as discussed. It seems safe to me. (sorry for the delay, and 
>> thanks for the reminder)
> 
> Not sure if that is a fix that will work in all cases. 
> 
> There is a potential timing problem with when the archiver is shutdown:
> that may now be fixed in 8.4, see what you think.

Can you elaborate?

> Also if archiving is currently stalled, then files will not be
> transferred, even if you switch xlogs. So this is at best a partial fix
> to the problem and the need for a manual check of file contents
> remains. 

Yep. Maybe we should print the filename of the last WAL segment to the 
log at shutdown, so that you can easily check that you have everything 
in the archive.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com

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