jihoonson opened a new pull request #9385: Enable 
druid.coordinator.kill.pendingSegments.on by default
URL: https://github.com/apache/druid/pull/9385
 
 
   ### Description
   
   `druid.coordinator.kill.pendingSegments.on` is to clean up stale entries in 
the `pendingSegments` table in the metadata store. This is pretty useful when 
you use the streaming ingestion because all append tasks need to allocate 
pending segments which can become slow as the `pendingSegments` table grows. 
This PR is to enable this option by default.
   
   <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.
   - [ ] 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/licenses.yaml)
   - [ ] 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.
   - [ ] added integration tests.
   - [ ] been tested in a test Druid cluster.

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