Horton

Re: Re: [COMMITTERS] pgsql: Basic Recovery Control functions for use in Hot Standby. Pause,

Robert Haas <robertmhaas@gmail.com>

View thread
From: Robert Haas <robertmhaas@gmail.com>
To: Fujii Masao <masao.fujii@gmail.com>
Cc: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>, Tom Lane <tgl@sss.pgh.pa.us>, Magnus Hagander <magnus@hagander.net>, Simon Riggs <simon@2ndquadrant.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2011-03-23T11:50:55Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Basic Recovery Control functions for use in Hot Standby. Pause, Resume,

On Wed, Mar 23, 2011 at 4:51 AM, Fujii Masao <masao.fujii@gmail.com> wrote:
> On Fri, Mar 18, 2011 at 9:31 PM, Robert Haas <robertmhaas@gmail.com> wrote:
>> On Fri, Mar 18, 2011 at 8:27 AM, Heikki Linnakangas
>> <heikki.linnakangas@enterprisedb.com> wrote:
>>> You could also argue for "log a warning, continue until we can open for Hot
>>> standby, then pause".
>>
>> I don't like that one much.
>>
>>> I can write the patch once we know what we want. All of those options sound
>>> reasonable to me. This is such a corner-case that it doesn't make sense to
>>> make it user-configurable, though.
>>
>> I agree.  Since pause_at_recovery_target is ignored when
>> hot_standby=off, I think it would be consistent to treat the case
>> where hot_standby=on but can't actually be initiated the same way -
>> just ignore the pause request and enter normal running.
>
> When hot_standby = on and the recovery target is ahead of the consistent point,
> the server doesn't enter normal running since FATAL error happens. So I think
> that it's more consistent to prevent the server from entering normal
> running also
> when hot_standby = off.

Actually, my previous email was all nonsense, wasn't it?  If we don't
reach the consistency point, we can't enter normal running anyway -
shut down is the only option no matter what.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company