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From: Julien Rouhaud <rjuju123@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Michael Paquier <michael@paquier.xyz>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: Add an optional timeout clause to isolationtester step.
Date: Sat, 7 Mar 2020 22:17:09 +0100
Message-ID: <20200307211709.6kfpiddif4uxafg5@nol> (raw)
In-Reply-To: <15903.1583615371@sss.pgh.pa.us>
References: <20200303092551.GB1890@paquier.xyz>
	<20200304051510.GE2593@paquier.xyz>
	<CAOBaU_Z=qkE42VQ25mps+zyAz+WUn3wZoev4uhGW+gAXBBS2YA@mail.gmail.com>
	<20200305035354.GQ2593@paquier.xyz>
	<20200306131547.GA2904@nol>
	<20200307014142.GC1531@paquier.xyz>
	<20200307061615.c47sju2bytuiaazv@nol>
	<8441.1583595994@sss.pgh.pa.us>
	<20200307205328.ffidfyo3me46qscn@nol>
	<15903.1583615371@sss.pgh.pa.us>

On Sat, Mar 07, 2020 at 04:09:31PM -0500, Tom Lane wrote:
> Julien Rouhaud <rjuju123@gmail.com> writes:
> > On Sat, Mar 07, 2020 at 10:46:34AM -0500, Tom Lane wrote:
> >> What's the actual need that you're trying to deal with?
>
> > Testing the correct behavior of non trivial commands, such as CIC/reindex
> > concurrently, that fails during the execution.
>
> Hmm ... don't see how a timeout helps with that?

For reindex concurrently, a SELECT FOR UPDATE on a different connection can
ensure that the reindex will be stuck at some point, so canceling the command
after a long enough timeout reproduces the original faulty behavior.





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  To: pgsql-hackers@postgresql.org
  Cc: rjuju123@gmail.com, tgl@sss.pgh.pa.us, michael@paquier.xyz
  Subject: Re: Add an optional timeout clause to isolationtester step.
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