Zakelly opened a new pull request, #21362:
URL: https://github.com/apache/flink/pull/21362
## What is the purpose of the change
Currently the HeapStateBackend check whether the current key group index is
a valid one while the RocksDBStateBackend will not.
This PR do this check in InternalKeyContextImpl#setCurrentKeyGroupIndex, to
expose the data correctness problem immediately when using RocksDB as well as
heap.
## Brief change log
* Add the checking logic in InternalKeyContextImpl#setCurrentKeyGroupIndex.
* Add a test for the new logic.
* Change some test code in CoBroadcastWithKeyedOperatorTest, since it fails
after adding the check.
## Verifying this change
This change added a new test class InternalKeyContextImplTest.
## 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): **yes**
- 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
- If yes, how is the feature documented? not applicable
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