LakshSingla opened a new pull request, #13062:
URL: https://github.com/apache/druid/pull/13062
### Description
In the current version of MSQ, workers are bound to a specific task. This is
not cool for a fault tolerant engine where worker tasks can be ephemeral, and
not bound to a specific task id, and can be respawned.in case the task they are
bound to fails.
This PR introduces a set of changes and reactors which makes the following
possible:
1. WorkerClient uses workerNumber instead of taskId to communicate between
the workerTasks, abstracting away the complexity of resolving the workerNumber
to the taskId from the callers.
2. `WorkerImpl` doesn't memoize the task location for the worker tasks and
instead fetches it from the `ControllerClient` every time it wants to contact
the worker.
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<hr>
##### Key changed/added classes in this PR
* `MyFoo`
* `OurBar`
* `TheirBaz`
<hr>
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This PR has:
- [ ] 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/dev/license.md)
- [ ] 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.
- [ ] added integration tests.
- [ ] been tested in a test Druid cluster.
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