From: | Nikolay Samokhvalov <samokhvalov(at)gmail(dot)com> |
---|---|
To: | Andrey Borodin <amborodin86(at)gmail(dot)com> |
Cc: | Nathan Bossart <nathandbossart(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Transaction timeout |
Date: | 2023-01-13 19:00:32 |
Message-ID: | CANNMO+JYA_FdO5SFayD1HxiFeioVdcx-TZSGyyDdQ0x5g6-1mw@mail.gmail.com |
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Lists: | pgsql-hackers |
On Fri, Jan 13, 2023 at 10:16 AM Andrey Borodin <amborodin86(at)gmail(dot)com>
wrote:
> > – it seems we could (should) have one more successful "1s wait, 3s
> sleep" iteration here, ~727ms somehow wasted in a loop, quite a lot.
>
> I think big chunk from these 727ms were spent between "BEGIN" and
> "select now(), clock_timestamp(), pg_sleep(3) \watch 1".
>
Not really – there was indeed ~2s delay between BEGIN and the first
pg_sleep query, but those ~727ms is something else.
here we measure the remainder between the beginning of the transaction
measured by "now()' and the the beginning of the last successful pg_sleep()
query:
gitpod=# select timestamptz '2023-01-13 15:51:18.179579+00' - '2023-01-13
15:49:22.906924+00';
?column?
-----------------
00:01:55.272655
(1 row)
It already includes all delays that we had from the beginning of our
transaction.
The problem with my question was that I didn't take into attention that
'2023-01-13 15:51:18.179579+00' is when the last successful query
*started*. So the remainder of our 2-min quota – 00:00:04.727345 – includes
the last successful loop (3s of successful query + 1s of waiting), and then
we have failed after ~700ms.
In other words, there are no issues here, all good.
> Many thanks for looking into this!
many thanks for implementing it
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