huwh opened a new pull request, #22913:
URL: https://github.com/apache/flink/pull/22913
## What is the purpose of the change
Improving the performance of the SlotSelectionStrategy by bulk selecting
tasks in the same region.
## Brief change log
- *Introduce FreeSlotCandidatesManager to manage available slots for
candidates*
- *Migerate SlotInfoWithUtilization to FreeSlotCandidatesManager for
SlotSelectionStrategy*
- *PhysicalSlotProvider support bulk select available slots*
## Verifying this change
- *Added unit tests for FreeSlotCandidatesManager*
- *Manually verified th change by wordcount job with 20000 parallelism*
- *Compare the benchmark of handleGlobalFailureAndRestartAllTasks*
## 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, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (no)
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