| 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 21:49:34 |
| Message-ID: | 20140110214934.GC28544@awork2.anarazel.de |
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| Thread: | |
| Lists: | pgsql-hackers |
On 2014-01-10 10:59:23 -0800, Joshua D. Drake wrote:
>
> On 01/10/2014 07:47 AM, Bruce Momjian wrote:
>
> >I know there was a desire to remove this TODO item, but I think we have
> >brought up enough new issues that we can keep it to see if we can come
> >up with a solution. I have added a link to this discussion on the TODO
> >item.
> >
> >I think we will need at least four new GUC variables:
> >
> >* timeout control for degraded mode
> >* command to run during switch to degraded mode
> >* command to run during switch from degraded mode
> >* read-only variable to report degraded mode
> >
>
> I know I am the one that instigated all of this so I want to be very clear
> on what I and what I am confident that my customers would expect.
>
> If a synchronous slave goes down, the master continues to operate. That is
> all. I don't care if it is configurable (I would be fine with that). I don't
> care if it is not automatic (e.g; slave goes down and we have to tell the
> master to continue).
Would you please explain, as precise as possible, what the advantages of
using a synchronous standby would be in such a scenario?
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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