tree 01a543389da24eef888c668d890b434aae5e8dc9
parent 751eeea172e125a7e44baf66b3728db5c348d279
author Xiangying Meng <55571188+liangyepianzhou@users.noreply.github.com> 1678414312 +0800
committer GitHub <noreply@github.com> 1678414312 +0800
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[cherry-pick][branch-2.10] Fix deadlock causes session notification not to work (#19754) (#19768)

Co-authored-by: Qiang Zhao <mattisonchao@apache.org>
Master https://github.com/apache/pulsar/pull/19754
### Motivation

This is a namespace bundle double-owners problem. We found it in the memory dumps.

The memory dumps show that the notification thread has been blocked for a long time by the leader election deadlock, And many notifications are blocked in the executor queue. This causes we can't to revalidate the locks, and they are still thinking them working well.

For private reasons, I can't share the namespace bundle snapshot, but the blocked thread easily explains it.

<img width="1061" alt="image" src="https://user-images.githubusercontent.com/74767115/223670419-c4319f44-f1e1-4361-8c79-04c7f0dabe3c.png"> ^^ blocked thread

<img width="949" alt="image" src="https://user-images.githubusercontent.com/74767115/223672000-fb4ce22c-6a45-4cb6-9d23-c36e3afbc93a.png">

^^ executor queue

### Modifications

- Avoid putting the new task to single thread executor causes deadlock.

(cherry picked from commit cbd799f05eb26aeac5ffd5bbb9751ad9e5928dd3)