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From: Pavel Stehule <[email protected]>
To: [email protected]
Cc: Achilleas Mantzios <[email protected]>
Cc: [email protected]
Subject: Re: Can a long running procedure detect when smart shutdown is pending?
Date: Sat, 6 Jul 2024 07:39:38 +0200
Message-ID: <CAFj8pRD7WHhsUkOyxw-fCBnPTShQxOeJSTzqa5zt-nzqSU2Rwg@mail.gmail.com> (raw)
In-Reply-To: <CAE=rie95=YwVnL9ix0Xwp2wfUZY7rSJ4Ji_uQEAiAdgdpOqvfQ@mail.gmail.com>
References: <CAE=rie-ZcNzzt_8bKrN-7fnnbYL-ofbne4jNurd3HjjW2j9Yaw@mail.gmail.com>
	<[email protected]>
	<CAE=rie95=YwVnL9ix0Xwp2wfUZY7rSJ4Ji_uQEAiAdgdpOqvfQ@mail.gmail.com>

so 6. 7. 2024 v 1:36 odesílatel Dennis White <[email protected]>
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.



>
> Thanks
>
> On Fri, Jul 5, 2024 at 4:57 PM Achilleas Mantzios <
> [email protected]> 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)
>>
>>

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