[pgpool-general: 3564] Re: Multiple active PGPool servers and Statement cache

[James Sewell]

This sounds perfect, so I could implement this now by just switching to
memcached?

Cheers,
James Sewell

On Friday, 20 March 2015, Tatsuo Ishii <ishii at postgresql.org> wrote:

> > Hey,
> >
> > This is more of a feature request. Once of our clients uses PGPool
> > Active/Active, and they have an interest in using statement cache.
> >
> > My understanding is that this will not work, as an update to PGPool a
> will
> > not invalidate PGPool b's cache object.
>
> Correct.
>
> > Would it be possible to implement the sharing of statement cache
> > invalidation via watchdog? Obviously this would be under the same proviso
> > that standard streaming replication is: that a PGPool node may be
> slightly
> > behind the other at any one time due to network lag.
>
> One idea is storing invalidation info onto memcached. Pgpool-II's
> query cache (statement cache) can already be on memcached and this is
> not terribly hard to implement. Also this way, we could avoid the
> concern you raise.
>
> What do you think?
>
> Best regards,
> --
> Tatsuo Ishii
> SRA OSS, Inc. Japan
> English: http://www.sraoss.co.jp/index_en.php
> Japanese:http://www.sraoss.co.jp
>
> > Cheers,
> >
> > James Sewell,
> > PostgreSQL Team Lead / Solutions Architect
> > ______________________________________
> >
> >
> >  Level 2, 50 Queen St, Melbourne VIC 3000
> >
> > *P *(+61) 3 8370 8000  *W* www.lisasoft.com  *F *(+61) 3 8370 8099
> >
> > --
> >
> >
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-- 

James Sewell,
PostgreSQL Team Lead / Solutions Architect
______________________________________


 Level 2, 50 Queen St, Melbourne VIC 3000

*P *(+61) 3 8370 8000  *W* www.lisasoft.com  *F *(+61) 3 8370 8099

-- 


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