adithyachakilam opened a new pull request, #16844:
URL: https://github.com/apache/druid/pull/16844
Fixes #13936.
### Description
In cases where a supervisor is idle and the overlord is restarted for some
reason, the supervisor would start spinning tasks again. In clusters where
there are many low throughput stream this spike the task count unnecessarily.
This PR checks if the latest offset with that of the ones committed in metadata
during the startup of supervisor and sets it idle state if they match.
#### Release note
Supervisor would not go back into running state from the idle if the
overlord restart happens for some reason.
<hr>
##### Key changed/added classes in this PR
* `SeekableStreamSupervisor`
<hr>
This PR has:
- [x] been self-reviewed.
- [ ] using the [concurrency
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
(Remove this item if the PR doesn't have any relation to concurrency.)
- [ ] added documentation for new or modified features or behaviors.
- [x] a release note entry in the PR description.
- [ ] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [ ] added or updated version, license, or notice information in
[licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md)
- [x] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [ ] added unit tests or modified existing tests to cover new code paths,
ensuring the threshold for [code
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
is met.
- [x] added integration tests.
- [x] been tested in a test Druid cluster.
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