georgew5656 opened a new pull request, #14918:
URL: https://github.com/apache/druid/pull/14918
### Description
Adding the ability for mm-less ingestion to zero-downtime migrate to and
from WorkerTaskRunners (using MM's)
The KubernetesAndWorkerTaskRunner is aware of tasks running on workers and
tasks running on Kubernetes, so it is able to cleanly rolling upgrade to/from
Kubernetes or the Worker task runner. It can choose to schedule tasks onto
either workers or onto Kubernetes depending on a config. Currently this is all
or nothing (there's no way to split task scheduling), but this is something
that could be added in the future.
#### Release note
Adding support for zero-downtime migration to WorkerTaskRunners
##### Key changed/added classes in this PR
* `KubernetesAndWorkerTaskRunnerConfig`
* `KubernetesAndWorkerTaskRunner`
* `KubernetesAndWorkerTaskRunnerFactory`
Also had to make a few supporting changes in TaskMaster/TaskRunner/CliPeon
- [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.
- [ ] a release note entry in the PR description.
- [X] 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.
- [X] 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.
- [X] been tested in a test Druid cluster.
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