Re: Data corruption issues using streaming replication on 9.0.14/9.2.5/9.3.1

On 2013-11-21 12:51:17 -0800, Josh Berkus wrote:
> On 11/21/2013 12:46 PM, Andres Freund wrote:
> > No. Check
> > http://archives.postgresql.org/message-id/20131120234141.GI18801%40awork2.anarazel.de
> > 
> > The problem is starting with hot_standby=on on a system with
> > recovery.conf present. It is independent of whether you use streaming
> > replication, archive based recovery, or just shutdown the server and
> > manually copy xlog segments there.
> > As long as hot_standby=on, and recovery.conf is present you can hit the
> > bug.
> 
> Oh, aha.  There have to be some transactions which are awaiting
> checkpoint, though, correct?  As in, if there's no activity on the
> master, you can't trigger the bug?

Correct. Also, if you *start* at such a checkpoint you're not vulnerable
until the standby is restarted.

Greetings,

Andres Freund

-- Andres Freund                       http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training &
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