Re: subscriptionCheck failures on nightjar

From: Michael Paquier <michael(at)paquier(dot)xyz>
To: Andres Freund <andres(at)anarazel(dot)de>
Cc: Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: subscriptionCheck failures on nightjar
Date: 2019-08-13 08:04:35
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On Wed, Feb 13, 2019 at 01:51:47PM -0800, Andres Freund wrote:
> I'm not yet sure that that's actually something that's supposed to
> happen, I got to spend some time analysing how this actually
> happens. Normally the contents of the slot should actually prevent it
> from being removed (as they're newer than
> ReplicationSlotsComputeLogicalRestartLSN()). I kind of wonder if that's
> a bug in the drop logic in newer releases.

In the same context, could it be a consequence of 9915de6c which has
introduced a conditional variable to control slot operations? This
could have exposed more easily a pre-existing race condition.

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