Re: subscriptionCheck failures on nightjar

From: Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>
To: Michael Paquier <michael(at)paquier(dot)xyz>
Cc: Kuntal Ghosh <kuntalghosh(dot)2007(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: subscriptionCheck failures on nightjar
Date: 2019-09-20 15:30:48
Message-ID: 20190920153048.wpe27ht5lcs3zlrm@development
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On Thu, Sep 19, 2019 at 01:23:05PM +0900, Michael Paquier wrote:
>On Wed, Sep 18, 2019 at 11:58:08PM +0200, Tomas Vondra wrote:
>> I kinda suspect it might be just a coincidence that it fails during that
>> particular test. What likely plays a role here is a checkpoint timing
>> (AFAICS that's the thing removing the file). On most systems the tests
>> complete before any checkpoint is triggered, hence no issue.
>> Maybe aggressively triggering checkpoints on the running cluter from
>> another session would do the trick ...
>Now that I recall, another thing I forgot to mention on this thread is
>that I patched guc.c to reduce the minimum of checkpoint_timeout to

But even with that change you haven't managed to reproduce the issue,
right? Or am I misunderstanding?


Tomas Vondra
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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