rkhachatryan opened a new pull request #19062:
URL: https://github.com/apache/flink/pull/19062
This is an alternative version of #19050 that solves the problem using
`MailboxExecutor`.
## What is the purpose of the change
```
When a task thread tries to schedule an upload, it might wait for available
capacity.
Capacity is released by the uploading thread on upload completion. After
releasing,
it must notify the task thread about the completion.
Both task and uploading thread acquire FsStateChangelogWriter.lock. That
causes
a deadlock if uploader releases capacity insufficient for task thread to
proceed.
This change removes the lock and makes uploader thread to use mailbox
actions.
```
## Verifying this change
`FsStateChangelogStorageTest.testDeadlockOnUploadCompletion`
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? no
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