Re: Funny WAL corruption issue

From: Aleksander Alekseev <a(dot)alekseev(at)postgrespro(dot)ru>
To: Chris Travers <chris(dot)travers(at)gmail(dot)com>
Cc: Vladimir Borodin <root(at)simply(dot)name>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Funny WAL corruption issue
Date: 2017-08-10 12:48:14
Message-ID: 20170810124814.GA32758@e733.localdomain
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Hi Chris,

> I ran into a funny situation today regarding PostgreSQL replication and
> wal corruption and wanted to go over what I think happened and what I
> wonder about as a possible solution.

Sad story. Unfortunately I have no idea what could be a reason nor can I
suggest a good way to find it unless there is an already know sequence
of steps that reproduces an issue.

I just wanted to point out that a hardware issue or third party software
issues (bugs in FS, software RAID, ...) could not be fully excluded from
the list of suspects. According to the talk by Christophe Pettus [1]
it's not that uncommon as most people think.

If the issue reproduces from time to time on one replica and doesn't on
the second identical replica there is a good chance that you've faced a
hardware issue. Another thing that is worth checking is a SMART status
of the hard drive.


Best regards,
Aleksander Alekseev

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