[DISCUSS] Likely Deadlock Scenario In 2.9, Possibly 2.10

[Michael Marshall <mm...@apache.org>]

Hello Pulsar Community,

I am in the process of investigating what I believe to be a broker
deadlock scenario that affects branch-2.9 and likely branch-2.10. (I
haven't had a chance to check branch-2.8 yet.)

I quickly described some of the details in this issue [0]. The
deadlock is related to waiting on the `metadata-store` thread for a
task to pending task to complete on that same `metadata-store` thread.
It is late for me, so I won't be able to investigate more until
tomorrow.

Since this behavior is in multiple versions of 2.9, we will need to
decide how to handle in-flight release candidates. Given that
2.10.0-candidate-2 hasn't been cut yet, it might be worth delaying
that tag just a little longer until we can get a solution.

I'm sharing before I have all of the details in the interest of
preventing unnecessary release candidates. Hopefully this is helpful.

Thanks,
Michael

[0] https://github.com/apache/pulsar/issues/14438

Re: [DISCUSS] Likely Deadlock Scenario In 2.9, Possibly 2.10

[PengHui Li <pe...@apache.org>]

Thanks, Michael,

I will wait for the solution.

Penghui

On Fri, Feb 25, 2022 at 3:12 PM Michael Marshall <mm...@apache.org>
wrote:

> Hello Pulsar Community,
>
> I am in the process of investigating what I believe to be a broker
> deadlock scenario that affects branch-2.9 and likely branch-2.10. (I
> haven't had a chance to check branch-2.8 yet.)
>
> I quickly described some of the details in this issue [0]. The
> deadlock is related to waiting on the `metadata-store` thread for a
> task to pending task to complete on that same `metadata-store` thread.
> It is late for me, so I won't be able to investigate more until
> tomorrow.
>
> Since this behavior is in multiple versions of 2.9, we will need to
> decide how to handle in-flight release candidates. Given that
> 2.10.0-candidate-2 hasn't been cut yet, it might be worth delaying
> that tag just a little longer until we can get a solution.
>
> I'm sharing before I have all of the details in the interest of
> preventing unnecessary release candidates. Hopefully this is helpful.
>
> Thanks,
> Michael
>
> [0] https://github.com/apache/pulsar/issues/14438
>