xintongsong opened a new pull request #12620:
URL: https://github.com/apache/flink/pull/12620
## What is the purpose of the change
This PR fixes the problem that `ActiveResourceManager` may request
unnecessary extra workers on termination of existing workers.
## Brief change log
The equation previously used by `ActiveResourceManager` for deciding whether
and how many new workers to request on termination of existing workers is:
`workersToRequest = workersRequiredBySlotManager -
workersRequestedByResourceManagerNotAllocated`
If there are workers allocated, being started but not yet registered,
unnecessary new workers will be requested.
Now the equation is changed to:
`workersToRequest = workersRequiredBySlotManager -
workersRequestedByResourceManagerNotRegistered`
## Verifying this change
New test cases added in `KubernetesResourceManagerTest` and
`YarnResourceManagerTest`.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (no)
- If yes, how is the feature documented? (not applicable
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