Re: Transaction timeout

On Fri, Dec 22, 2023 at 1:39 PM Japin Li <japinli@hotmail.com> wrote:
>
>
> On Tue, 19 Dec 2023 at 22:06, Japin Li <japinli@hotmail.com> wrote:
> > On Tue, 19 Dec 2023 at 18:27, Andrey M. Borodin <x4mmm@yandex-team.ru> wrote:
> >>> On 19 Dec 2023, at 13:26, Andrey M. Borodin <x4mmm@yandex-team.ru> wrote:
> >>>
> >>> I don’t have Windows machine, so I hope CF bot will pick this.
> >>
> >> I used Github CI to produce version of tests that seems to be is stable on Windows.
> >
> > It still failed on Windows Server 2019 [1].
> >
> > diff -w -U3 C:/cirrus/src/test/isolation/expected/timeouts.out
C:/cirrus/build/testrun/isolation/isolation/results/timeouts.out
> > --- C:/cirrus/src/test/isolation/expected/timeouts.out        2023-12-19 10:34:30.354721100 +0000
> > +++ C:/cirrus/build/testrun/isolation/isolation/results/timeouts.out  2023-12-19 10:38:25.877981600 +0000
> > @@ -100,7 +100,7 @@
> >  step stt3_check_stt2: SELECT count(*) FROM pg_stat_activity WHERE application_name = 'isolation/timeouts/stt2'
> >  count
> >  -----
> > -    0
> > +    1
> >  (1 row)
> >
> >  step itt4_set: SET idle_in_transaction_session_timeout = '1ms'; SET statement_timeout = '10s'; SET lock_timeout =
'10s';SET transaction_timeout = '10s'; 
> >
> > [1]
https://api.cirrus-ci.com/v1/artifact/task/4707530400595968/testrun/build/testrun/isolation/isolation/regression.diffs
>
> Hi,
>
> I try to split the test for transaction timeout, and all passed on my CI [1].
>
> OTOH, I find if I set transaction_timeout in a transaction, it will not take
> effect immediately.  For example:
>
> [local]:2049802 postgres=# BEGIN;
> BEGIN
> [local]:2049802 postgres=*# SET transaction_timeout TO '1s';
when this execute, TransactionTimeout is still 0, this command will
not set timeout
> SET
> [local]:2049802 postgres=*# SELECT relname FROM pg_class LIMIT 1;  -- wait 10s
when this command get execute, start_xact_command will enable the timer
>    relname
> --------------
>  pg_statistic
> (1 row)
>
> [local]:2049802 postgres=*# SELECT relname FROM pg_class LIMIT 1;
> FATAL:  terminating connection due to transaction timeout
> server closed the connection unexpectedly
>         This probably means the server terminated abnormally
>         before or while processing the request.
> The connection to the server was lost. Attempting reset: Succeeded.
>
> It looks odd.  Does this is expected? I'm not read all the threads,
> am I missing something?

I think this is by design, if you debug statement_timeout, it's the same
behaviour, the timeout will be set for each command after the second
command was called, you just aren't aware of this.

I doubt people will set this in a transaction.
>
> [1] https://cirrus-ci.com/build/6574686130143232
>
> --
> Regrads,
> Japin Li
> ChengDu WenWu Information Technology Co., Ltd.
>


--
Regards
Junwang Zhao