From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
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To: | Magnus Hagander <magnus(at)hagander(dot)net> |
Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Re: [COMMITTERS] pgsql: If recovery_target_timeline is set to 'latest' and standby mode |
Date: | 2011-03-07 19:24:56 |
Message-ID: | 4D753108.7030503@enterprisedb.com |
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Lists: | pgsql-committers pgsql-hackers |
On 07.03.2011 21:20, Magnus Hagander wrote:
> On Mon, Mar 7, 2011 at 20:16, Heikki Linnakangas
> <heikki(dot)linnakangas(at)iki(dot)fi> wrote:
>> If recovery_target_timeline is set to 'latest' and standby mode is enabled,
>> periodically rescan the archive for new timelines, while waiting for new WAL
>> segments to arrive. This allows you to set up a standby server that follows
>> the TLI change if another standby server is promoted to master. Before this,
>> you had to restart the standby server to make it notice the new timeline.
>
> Can we make recovery_target_timeline='latest' the default when we are
> in standby mode? That would suddenly make it a lot easier to "repoint
> a slave" after a switchover...
Hmm, seems reasonable. 'latest' is what you usually want, at least in
standby mode. Though it would be strange to have a different default
depending on the value of another setting. Maybe we should change the
default regardless of standby_mode?
Wë́'d need a magic value to mean the current default behavior, to recover
to the current timeline. 'current'?
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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