LakshSingla opened a new pull request, #14369:
URL: https://github.com/apache/druid/pull/14369
### Description
This PR fixes an NPE in the controller which occurs when the controller
awaits for the workers to stop even before the `workerTaskLauncher` is
initialized. This would be a common occurrence in cases where the controller
fails while initializing the query, for example, when the MSQ is unable to
generate a query definition for the submitted query.
<hr>
##### Key changed/added classes in this PR
* `ControllerImpl`
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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.)
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