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Re: Re: [COMMITTERS] pgsql: Make standby server continuously retry restoring the next WAL

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Dimitri Fontaine <dfontaine(at)hi-media(dot)com>
Cc: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Re: [COMMITTERS] pgsql: Make standby server continuously retry restoring the next WAL
Date: 2010-02-11 13:50:50
Message-ID: 1265896250.7341.1627.camel@ebony (view raw or flat)
Thread:
Lists: pgsql-committerspgsql-docspgsql-hackers
On Thu, 2010-02-11 at 14:41 +0100, Dimitri Fontaine wrote:
> Simon Riggs <simon(at)2ndQuadrant(dot)com> writes:
> > If you were running pg_standby as the restore_command then this error
> > wouldn't happen. So you need to explain why running pg_standby cannot
> > solve your problem and why we must fix it by replicating code that has
> > previously existed elsewhere.
> 
> Let me try.
> 
> pg_standby will not let the server get back to streaming replication
> mode once it's done with driving the replay of all the WAL files
> available in the archive, but will have the server sits there waiting
> for the next file.
> 
> The way we want that is implemented now is to have the server switch
> back and forth between replaying from the archive and streaming from the
> master. So we want the server to restore from the archive the same way
> pg_standby used to, except that if the archive does not contain the next
> WAL files, we want to get back to streaming.
> 
> And the archive reading will resume at next network glitch.
> 
> I think it's the reasonning, I hope it explains what you see happening.

OK, thanks.

One question then: how do we ensure that the archive does not grow too
big? pg_standby cleans down the archive using %R. That function appears
to not exist anymore. 

-- 
 Simon Riggs           www.2ndQuadrant.com


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