Re: Causal reads take II

From: Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>
To: Dmitry Dolgov <9erthalion6(at)gmail(dot)com>
Cc: Simon Riggs <simon(at)2ndquadrant(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Causal reads take II
Date: 2017-10-27 21:24:14
Message-ID: CAEepm=352uctNiFoN84UN4gtunbeTK-PBLouVe8i_b8ZPcJQFQ@mail.gmail.com
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On Sun, Oct 1, 2017 at 10:03 AM, Thomas Munro
<thomas(dot)munro(at)enterprisedb(dot)com> wrote:
>> I tried few more times, and I've got it two times from four attempts on a
>> fresh
>> installation (when all instances were on the same machine). But anyway I'll
>> try
>> to investigate, maybe it has something to do with my environment.
>>
>> ...
>>
>> 2017-09-30 15:47:55.154 CEST [6030] LOG: invalid magic number 0000 in log
>> segment 000000010000000000000020, offset 10092544
>
> Hi Dmitry,
>
> Thanks for testing. Yeah, it looks like the patch may be corrupting
> the WAL stream in some case that I didn't hit in my own testing
> procedure. I will try to reproduce these failures.

Hi Dmitry,

I managed to reproduce something like this on one of my home lab
machines running a different OS. Not sure why yet and it doesn't
happen on my primary development box which is how I hadn't noticed it.
I will investigate and aim to get a fix posted in time for the
Commitfest. I'm also hoping to corner Simon at PGDay Australia in a
couple of weeks to discuss this proposal...

--
Thomas Munro
http://www.enterprisedb.com

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