Re: Can a long running procedure detect when smart shutdown is pending?

From: Achilleas Mantzios <a(dot)mantzios(at)cloud(dot)gatewaynet(dot)com>
To: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, dwhite(at)seawardmoon(dot)com
Cc: pgsql-general(at)lists(dot)postgresql(dot)org
Subject: Re: Can a long running procedure detect when smart shutdown is pending?
Date: 2024-07-06 06:06:13
Message-ID: 4d1943be-b6f5-4b9b-92fb-9bd7d9ba07e5@cloud.gatewaynet.com
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Στις 6/7/24 08:39, ο/η Pavel Stehule έγραψε:
>
>
> so 6. 7. 2024 v 1:36 odesílatel Dennis White <dwhite(at)seawardmoon(dot)com>
> napsal:
>
> Thanks for responding.
> This will be a stored procedure written in plpgsql that's kicked
> off by pg_cron.
> I wasn't sure a normal smart shutdown would stop it.
>
>
> shutdown try to cancel any query. The plpgsql routine should be
> canceled without problems.
fast mode will have this effect. smart mode not, from my testing. The
running queries do not get interrupted in smart shutdown.
>
>
>
> Thanks
>
> On Fri, Jul 5, 2024 at 4:57 PM Achilleas Mantzios
> <a(dot)mantzios(at)cloud(dot)gatewaynet(dot)com> wrote:
>
> Στις 5/7/24 21:12, ο/η Dennis White έγραψε:
>> My project's DB has a mutli-step stored procedure using
>> Transaction Control that may take 30 minutes or more to complete.
>> I am curious if there is a way to make it more smart shutdown
>> friendly so it can stop between steps?
>>
>> We are using both PG 14 and PG 16 on Rhel 8.
>> Pardon me if it's obvious but is there a function to call or
>> a table that could be checked after a commit within the
>> procedure to determine a shutdown is pending?
>
> Maybe somehow checking the log for a message like :
>
> received smart shutdown request
>
> Or use tail_n_mail against the log and then implement some
> logic using NOTIFY , ideally you want your procedure to be
> interrupted rather than do polling.
>
>>
>> Thanks,
>> Dennis
>
> --
> Achilleas Mantzios
> IT DEV - HEAD
> IT DEPT
> Dynacom Tankers Mgmt (as agents only)
>
--
Achilleas Mantzios
IT DEV - HEAD
IT DEPT
Dynacom Tankers Mgmt (as agents only)

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