| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
| Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Markus Wanner <markus(at)bluegap(dot)ch>, Dimitri Fontaine <dimitri(at)2ndquadrant(dot)fr>, Jeff Davis <pgsql(at)j-davis(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Issues with Quorum Commit |
| Date: | 2010-10-08 14:57:21 |
| Message-ID: | 1286549841.2304.948.camel@ebony |
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| Lists: | pgsql-hackers |
On Fri, 2010-10-08 at 23:55 +0900, Fujii Masao wrote:
> On Fri, Oct 8, 2010 at 6:00 PM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> > >From the perspective of an observer, randomly selecting a standby for
> > load balancing purposes: No, they are not guaranteed to see the "latest"
> > answer, nor even can they find out whether what they are seeing is the
> > latest answer.
>
> To guarantee that each standby returns the same result, we would need to
> use the cluster-wide snapshot to run queries. IIRC, Postgres-XC provides
> that feature. Though I'm not sure if it can be applied in HS/SR.
That is my understanding.
--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Training and Services
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