Re: Replication and fsync

From: Alban Hertroys <haramrae(at)gmail(dot)com>
To: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
Cc: maillists0(at)gmail(dot)com, PostgreSQL pg-general List <pgsql-general(at)postgresql(dot)org>
Subject: Re: Replication and fsync
Date: 2013-10-24 13:42:31
Message-ID: CAF-3MvM_cAUP_yMn3F7JNDQY14zp5DGX3J9Y=-utP1W28nmKvg@mail.gmail.com
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On 24 October 2013 15:04, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
> On Thu, Oct 24, 2013 at 10:39 AM, <maillists0(at)gmail(dot)com> wrote:
>> Am I wrong? If I'm wrong, is there still danger to the slave
>> in this kind of setup?
>
> No, I think.

Corruption due to fsync being off on the master will be replicated to
the slave, or - if corruption is bad enough - replication will fail to
replicate affected records entirely. Of course, turning fsync off is
no guarantee for corruption - it's the other way around: having it on
guarantees that you don't get corruption (provided that... etc).

You could disable replication while fsync is off. I'd verify the data
on the master (by creating a dump, for example) before re-enabling it
again, though.

--
If you can't see the forest for the trees,
Cut the trees and you'll see there is no forest.

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