Zakelly opened a new pull request, #25831:
URL: https://github.com/apache/flink/pull/25831
## What is the purpose of the change
As first part of FLIP-488, this PR introduces `enableAsycState` in
KeyedStream and its related interface classes. Also it provides a basic
implementation of async reduce operator.
## Brief change log
Please check each commit.
- Introduce `enableAsyncState` API
- Introduce serializer based state descriptor constructors
- Implement async reduce operator
- Introduce async state version of wordcount example
## Verifying this change
This PR adds a IT test on the wordcount example, which can be a IT test of
new APIs and reduce operator.
## 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
- If yes, how is the feature documented? not applicable
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