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From Abhishek S <abks...@gmail.com>
Subject Re: Problem: upgrade 1.2 to 1.3 caused loss of clean shutdown on SIGTERM
Date Wed, 08 Jan 2020 03:11:52 GMT
The rational behind moving the shutdown handler out of SamzaContainer was
to let standalone jobs (which are usually part of other online
applications) maintain their own shutdown hooks.
This prevents Samza hooks from running in parallel or causing a deadlock
with the shutdown hooks of parent application that uses Samza in standalone
mode (as a library).

That being said, I agree that Containers should attempt graceful shutdown
and wait at-most "task.shutdown.ms" on SIGTERM.
I created SAMZA-2426 to investigate the issue further and track the work
required.

Abhishek






On Tue, Jan 7, 2020 at 1:55 PM Brett Konold <bkonold@linkedin.com.invalid>
wrote:

> Thunder,
>
> How were you able to determine that the shutdown hooks are not being
> called?
>
> If you're able to share any of your shutdown logs from before and after
> your 1.3 upgrade, that would be helpful while I try to reproduce this issue
> myself.
>
> Brett
> ________________________________
> From: Brett Konold <bkonold@linkedin.com>
> Sent: Tuesday, January 7, 2020 1:25 PM
> To: dev@samza.apache.org <dev@samza.apache.org>
> Subject: Re: Problem: upgrade 1.2 to 1.3 caused loss of clean shutdown on
> SIGTERM
>
> Hey Thunder,
>
> Thanks for reporting. Taking a look into this and will get back to you
> when I have something.
>
> Brett
> ________________________________
> From: Thunder Stumpges <thunder.stumpges@gmail.com>
> Sent: Monday, January 6, 2020 6:54 PM
> To: dev@samza.apache.org <dev@samza.apache.org>
> Subject: Problem: upgrade 1.2 to 1.3 caused loss of clean shutdown on
> SIGTERM
>
> We are attempting to upgrade from samza 1.2 to 1.3 in hopes of fixing
>
> https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fissues.apache.org%2Fjira%2Fbrowse%2FSAMZA-2198&amp;data=02%7C01%7Cbkonold%40linkedin.com%7C3d5e0f0bf97e4cc633de08d7931d06ad%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637139625187723288&amp;sdata=uwKMfKxQmS9uWS62Hew814P%2Fja7FpaViNTVzYrp03Ok%3D&amp;reserved=0
> where there was a deadlock
> in the shutdown code which prevented completing a clean shutdown.
>
> After the upgrade, it appears like NONE of the shutdown hooks / code are
> being called and it just immediately shuts down.
>
> We are running stand alone Low Level Tasks with LocalApplicationRunner /
> ZkJobCoordinator in Docker / K8s.
>
> When killing from docker for testing, we use docker kill -s SIGTERM
> <container> to send SIGTERM instead of SIGKILL. This was working in samza
> 1.2 (other than the deadlock from the above issue).
>
> Any ideas what changed?
>
> Thanks,
> Thunder
>

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