From: Simon Riggs <simon@2ndQuadrant.com>
To: Dimitri Fontaine <dfontaine@hi-media.com>
Cc: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Cc: Fujii Masao <masao.fujii@gmail.com>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: Re: [COMMITTERS] pgsql: Make standby server continuously retry restoring the next WAL
Date: Thu, 11 Feb 2010 13:50:50 +0000
Message-ID: <1265896250.7341.1627.camel@ebony> (raw)
In-Reply-To: <877hqjc2kk.fsf@hi-media-techno.com>
References: <20100127152751.3B2047541B9@cvs.postgresql.org>
<3f0b79eb1002092105r21e009d3v468496058ba04392@mail.gmail.com>
<4B726120.80007@enterprisedb.com>
<1265884657.7341.1192.camel@ebony>
<4B73F678.8070109@enterprisedb.com>
<1265891248.7341.1346.camel@ebony>
<4B73FB99.4080403@enterprisedb.com>
<1265893599.7341.1454.camel@ebony>
<877hqjc2kk.fsf@hi-media-techno.com>
On Thu, 2010-02-11 at 14:41 +0100, Dimitri Fontaine wrote:
> Simon Riggs <simon@2ndQuadrant.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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Cc: simon@2ndQuadrant.com, dfontaine@hi-media.com, heikki.linnakangas@enterprisedb.com, masao.fujii@gmail.com, pgsql-hackers@postgresql.org
Subject: Re: Re: [COMMITTERS] pgsql: Make standby server continuously retry restoring the next WAL
In-Reply-To: <1265896250.7341.1627.camel@ebony>
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