From: Tom Lane <tgl@sss.pgh.pa.us>
To: Petr Jelinek <petr.jelinek@2ndquadrant.com>
Cc: Peter Eisentraut <peter_e@gmx.net>
Cc: pgsql-committers@postgresql.org
Subject: Re: pgsql: Add support for temporary replication slots
Date: Mon, 12 Dec 2016 19:40:37 -0500
Message-ID: <18684.1481589637@sss.pgh.pa.us> (raw)
In-Reply-To: <314cae39-2e7d-f5a3-d226-cfb80cf80481@2ndquadrant.com>
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Petr Jelinek <petr.jelinek@2ndquadrant.com> writes:
> On 13/12/16 00:39, Tom Lane wrote:
>> Hm, buildfarm says this didn't fix it. Where exactly does the dropping
>> of the slot happen ... is it not complete by the time the backend exits?
> Yes, I've seen. The cleanup of slots is done in ProcKill(), I wonder,
> since it's on_shmem_exit hook, and the pgstat_beshutdown_hook is as
> well, maybe the pgstat_beshutdown_hook is called before ProcKill and the
> query is lucky to hit right in between.
Hm. That seems like a pretty bogus place to do it. An awful lot of the
backend infrastructure is already gone by then, if I recall the ordering
correctly. Maybe ShutdownPostgres would be a saner place; but it really
depends on what you think the module layering is for this facility.
I would definitely not think it is proc.c's responsibility, though.
regards, tom lane
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To: pgsql-committers@postgresql.org
Cc: tgl@sss.pgh.pa.us, petr.jelinek@2ndquadrant.com, peter_e@gmx.net
Subject: Re: pgsql: Add support for temporary replication slots
In-Reply-To: <18684.1481589637@sss.pgh.pa.us>
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