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From: Tomas Vondra <[email protected]>
To: Michael Paquier <[email protected]>
Cc: Kuntal Ghosh <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Robert Haas <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: Thomas Munro <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: subscriptionCheck failures on nightjar
Date: Fri, 20 Sep 2019 17:30:48 +0200
Message-ID: <20190920153048.wpe27ht5lcs3zlrm@development> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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	<CA+TgmoaNOMG9+Ho9d3CX+-10O7+nqqvmSpXb1m0F3dqWB4C-8g@mail.gmail.com>
	<[email protected]>
	<20190917194510.iqwyl3be62pz7l27@development>
	<[email protected]>
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	<20190918215808.yonxqgycme6pbctp@development>
	<[email protected]>

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
>1s.

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

regarss

-- 
Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services 

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