Zakelly opened a new pull request, #25394:
URL: https://github.com/apache/flink/pull/25394
## What is the purpose of the change
Currently, the forst reuse serialized key in any state with any namespaces,
which is problematic in parallel state execution. This PR fixes this by limit
the key reuse in most common case, where there is no user key (not map state)
and no customized namespace specified (only void namespace).
## Brief change log
- Extract the common part of key reuse in Value/List/Reducing State.
- Determine key reuse in constructor in those states.
- Disable key reuse in MapState.
## Verifying this change
This change is already covered by existing tests.
## 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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