| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Kevin Grittner <kgrittn(at)ymail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Simon Riggs <simon(at)2ndQuadrant(dot)com>, Rajeev rastogi <rajeev(dot)rastogi(at)huawei(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Standalone synchronous master |
| Date: | 2014-01-08 23:04:38 |
| Message-ID: | 20140108230438.GT14280@awork2.anarazel.de |
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| Lists: | pgsql-hackers |
On 2014-01-08 14:52:07 -0800, Joshua D. Drake wrote:
> On 01/08/2014 02:46 PM, Andres Freund wrote:
> >>The idea is that we know that data on db0 is not written until we know for a
> >>fact that db1 also has that data. That is great and a guarantee of data
> >>integrity between the two nodes.
> >
> >That guarantee is never there. The only thing guaranteed is that the
> >client isn't notified of the commit until db1 has received the data.
>
> Well ugh on that.. but that is for another reply.
You do realize that locally you have the same guarantees? If the client
didn't receive a reply to a COMMIT you won't know whether the tx
committed or not. If that's not sufficient you need to use 2pc and a
transaction manager.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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