From: Justin Pryzby <pryzby@telsasoft.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
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, 8 Mar 2020 14:14:56 -0500
Message-ID: <20200308191456.GD1357@telsasoft.com> (raw)
In-Reply-To: <27334.1583692669@sss.pgh.pa.us>
References: <20200308173103.GC1357@telsasoft.com>
<27334.1583692669@sss.pgh.pa.us>
On Sun, Mar 08, 2020 at 02:37:49PM -0400, Tom Lane wrote:
> 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.
Thanks for the analysis.
Do you mean it should enumerate all files during the initial SRF call, or use
something other than the SRF_* macros ?
--
Justin
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To: pgsql-hackers@postgresql.org
Cc: pryzby@telsasoft.com, tgl@sss.pgh.pa.us, 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: <20200308191456.GD1357@telsasoft.com>
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