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

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