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From: Tom Lane <[email protected]>
To: Justin Pryzby <[email protected]>
Cc: Alexander Lakhin <[email protected]>
Cc: Alvaro Herrera <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: Peter Eisentraut <[email protected]>
Cc: Soumyadeep Chakraborty <[email protected]>
Cc: Zhihong Yu <[email protected]>
Cc: [email protected]
Cc: Ashwin Agrawal <[email protected]>
Cc: [email protected]
Subject: Re: ALTER TABLE SET ACCESS METHOD on partitioned tables
Date: Tue, 02 Apr 2024 01:06:06 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <ZglExpzL9w0MtBWf@pryzbyj2023>
References: <[email protected]>
	<[email protected]>
	<ZglExpzL9w0MtBWf@pryzbyj2023>

Justin Pryzby <[email protected]> writes:
> On Sun, Mar 31, 2024 at 12:00:00PM +0300, Alexander Lakhin wrote:
>> I've stumbled upon a test failure caused by the test query added in that
>> commit:
>> +ERROR:  deadlock detected
>> +DETAIL:  Process 3076180 waits for AccessShareLock on relation 1259 of database 16386; blocked by process 3076181.
>> +Process 3076181 waits for AccessShareLock on relation 2601 of database 16386; blocked by process 3076180.

> I think means that, although it was cute to use pg_am in the reproducer
> given in the problem report, it's not a good choice to use here in the
> sql regression tests.

Another case here:

https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=sevengill&dt=2024-04-02%2001%3A32%3A17

AFAICS, e2395cdbe posits that taking exclusive lock on pg_am in the
middle of a bunch of concurrent regression scripts couldn't possibly
cause any problems.  Really?

			regards, tom lane

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