Re: Transaction timeout

On Sat, Dec 23, 2023 at 10:40 AM Japin Li <japinli(at)hotmail(dot)com> wrote:
>
>
> On Sat, 23 Dec 2023 at 08:32, Japin Li <japinli(at)hotmail(dot)com> wrote:
> > On Fri, 22 Dec 2023 at 23:30, Junwang Zhao <zhjwpku(at)gmail(dot)com> wrote:
> >> On Fri, Dec 22, 2023 at 10:44 PM Japin Li <japinli(at)hotmail(dot)com> wrote:
> >>>
> >>>
> >>> On Fri, 22 Dec 2023 at 22:37, Junwang Zhao <zhjwpku(at)gmail(dot)com> wrote:
> >>> > On Fri, Dec 22, 2023 at 10:25 PM Japin Li <japinli(at)hotmail(dot)com> wrote:
> >>> >> I try to set idle_in_transaction_session_timeout after begin transaction,
> >>> >> it changes immediately, so I think transaction_timeout should also be take
> >>> >> immediately.
> >>> >
> >>> > Ah, right, idle_in_transaction_session_timeout is set after the set
> >>> > command finishes and before the backend send *ready for query*
> >>> > to the client, so the value of the GUC is already set before
> >>> > next command.
> >>> >
> >>>
> >>> I mean, is it possible to set transaction_timeout before next comand?
> >>>
> >> Yeah, it's possible, set transaction_timeout in the when it first
> >> goes into *idle in transaction* mode, see the attached files.
> >>
> >
> > Thanks for updating the patch, LGTM.
>
> Sorry for the noise!
>
> Read the previous threads, I find why the author enable transaction_timeout
> in start_xact_command().
>
> The v15 patch cannot handle COMMIT AND CHAIN, see [1]. For example:

I didn't read the previous threads, sorry for that, let's stick to v14.

>
> SET transaction_timeout TO '2s'; BEGIN; SELECT 1, pg_sleep(1); COMMIT AND CHAIN; SELECT 2, pg_sleep(1); COMMIT;
>
> The transaction_timeout do not reset when executing COMMIT AND CHAIN.
>
> [1] https://www.postgresql.org/message-id/a906dea1-76a1-4f26-76c5-a7efad3ef5b8%40oss.nttdata.com
>
> --
> Regrads,
> Japin Li
> ChengDu WenWu Information Technology Co., Ltd.

--
Regards
Junwang Zhao