From: Tom Lane <tgl@sss.pgh.pa.us>
To: Justin Pryzby <pryzby@telsasoft.com>
Cc: pgsql-hackers@postgresql.org, Fabien COELHO <coelho@cri.ensmp.fr>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: David Steele <david@pgmasters.net>
Cc: Bossart, Nathan <bossartn@amazon.com>
Cc: Thomas Munro <thomas.munro@gmail.com>
Subject: Re: pg11+: pg_ls_*dir LIMIT 1: temporary files .. not closed at end-of-transaction
Date: Sun, 08 Mar 2020 14:37:49 -0400
Message-ID: <27334.1583692669@sss.pgh.pa.us> (raw)
In-Reply-To: <20200308173103.GC1357@telsasoft.com>
References: <20200308173103.GC1357@telsasoft.com>
Justin Pryzby <pryzby@telsasoft.com> writes:
> While working on a patch, I noticed this pre-existing behavior, which seems to
> be new since v11, maybe due to changes to SRF.
> |postgres=# SELECT pg_ls_dir('.') LIMIT 1;
> |WARNING: 1 temporary files and directories not closed at end-of-transaction
Hmm, actually it looks to me like pg_ls_dir has been broken forever.
The reason the warning didn't show up before v11 is that CleanupTempFiles
didn't bleat about leaked "allocated" directories before that
(cf 9cb7db3f0).
I guess we ought to change that function to use returns-a-tuplestore
protocol instead of thinking it can hold a directory open across calls.
It's not hard to think of use-cases where the existing behavior would
cause issues worse than a nanny-ish WARNING, especially on platforms
with tight "ulimit -n" limits.
regards, tom lane
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To: pgsql-hackers@postgresql.org
Cc: tgl@sss.pgh.pa.us, pryzby@telsasoft.com, coelho@cri.ensmp.fr, alvherre@2ndquadrant.com, david@pgmasters.net, bossartn@amazon.com, thomas.munro@gmail.com
Subject: Re: pg11+: pg_ls_*dir LIMIT 1: temporary files .. not closed at end-of-transaction
In-Reply-To: <27334.1583692669@sss.pgh.pa.us>
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