| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Hannu Krosing <hannu(at)2ndquadrant(dot)com>, MauMau <maumau307(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Kevin Grittner <kgrittn(at)ymail(dot)com>, 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 <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Standalone synchronous master |
| Date: | 2014-01-10 22:47:40 |
| Message-ID: | 20140110224740.GC13568@awork2.anarazel.de |
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| Lists: | pgsql-hackers |
On 2014-01-10 14:44:28 -0800, Joshua D. Drake wrote:
>
> On 01/10/2014 02:33 PM, Andres Freund wrote:
> >
> >On 2014-01-10 14:29:58 -0800, Joshua D. Drake wrote:
> >>db02 goes down. It doesn't matter why. It is down. db01 continues to accept
> >>orders, allow people to log into the website and we can still service
> >>accounts. The continuity of service continues.
> >
> >Why is that configuration advantageous over a async configuration is the
> >question. Why, with those requirements, are you using a synchronous
> >standby at all?
>
> If the master goes down, I can fail over knowing that as many of my
> transactions as possible have been replicated.
It's not like async replication mode delays sending data to the standby
in any way.
Really, the commits themselves are sent to the server at exactly the
same speed independent of sync/async. The only thing that's delayed is
the *notificiation* of the client that sent the commit. Not the commit
itself.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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