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From: Michael Paquier <[email protected]>
To: Andres Freund <[email protected]>
Cc: Thomas Munro <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: subscriptionCheck failures on nightjar
Date: Tue, 13 Aug 2019 17:04:35 +0900
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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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.
--
Michael


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