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Re: Parameter name standby_mode

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
Cc: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Joachim Wieland <joe(at)mcknight(dot)de>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Parameter name standby_mode
Date: 2010-03-31 21:26:05
Message-ID: (view raw or whole thread)
Lists: pgsql-hackers
On Wed, Mar 31, 2010 at 5:23 PM, Heikki Linnakangas
<heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
> Robert Haas wrote:
>> Is it reasonable to think that we can find a way to make it not print
>> the duplicate messages over and over again?
>> LOG:  record with zero length at 0/3006B28
>> Maybe only print that if the location has advanced since the last such message?
> Yeah, seems reasonable.
>> Should we make it shut down if it can't immediately read enough WAL to
>> get to a consistent state, or just figure it's the user's job to fix
>> it?
> I'd say no. In testing, I have done this many times:
> pg_start_backup()
> copy data directory to server
> create recovery.conf
> Start standby server.
> pg_stop_backup()
> The standby doesn't reach consistency before it sees the end-of-backup
> record written by pg_stop_backup(), but it does replay up to the last
> WAL segment, and connect to the master.
> Not sure if that's useful in real life, but there could be situations
> where restore_command isn't totally reliable, for example, and it's good
> to keep trying.

I was only thinking of doing it in the case where there's no
primary_conninfo or restore_command.


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