| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Michael Paquier <michael(at)paquier(dot)xyz>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Anastasia Lubennikova <lubennikovaav(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: A test for replay of regression tests |
| Date: | 2022-02-02 01:35:02 |
| Message-ID: | CA+hUKGK6mG8-6VieDm3sz2yzqMqw7j_=ag=_XmKLKsS-hG6KQw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Feb 2, 2022 at 2:14 PM Andres Freund <andres(at)anarazel(dot)de> wrote:
> On 2022-02-02 13:59:56 +1300, Thomas Munro wrote:
> > 2022-02-01 04:47:59.294 EST [3670:15] 027_stream_regress.pl LOG:
> > statement: SET TRANSACTION ISOLATION LEVEL REPEATABLE READ, READ ONLY
> > ...
> > 2022-02-01 04:49:09.881 EST [3683:2585] 027_stream_regress.pl ERROR:
> > canceling statement due to conflict with recovery
>
> That, uh, seems slow. Is it perhaps waiting for a lock? Seems
> Cluster.pm::init() should add at least log_lock_waits...
I quoted the wrong lines, let me try that again this time for the same
session, the one with pid 3683:
2022-02-01 04:48:38.352 EST [3683:15] 027_stream_regress.pl LOG:
statement: SET TRANSACTION ISOLATION LEVEL REPEATABLE READ, READ ONLY
...
2022-02-01 04:49:09.881 EST [3683:2585] 027_stream_regress.pl ERROR:
canceling statement due to conflict with recovery
It looks like it's processing statements fairly consistently slowly
through the whole period. Each non-trivial statement takes a bit
under ~10ms, so it would make sense if by the time we've processed
~2.5k lines we've clocked up 30 seconds and a VACUUM replay whacks us.
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