Zakelly opened a new pull request, #26005:
URL: https://github.com/apache/flink/pull/26005
## What is the purpose of the change
Currently, if user enables the async state processing, and use one state
backends supporting async state access (e.g. ForSt State Backend), but invokes
synchronous methods (e.g. `get()`, `add()`), there is performance issue for
state access. The default implementation of synchronous methods for the case
above is submitting a async state access and wait. This PR applies an
optimization that bypass all the async executions and just access the state in
synchronous way.
## Brief change log
- Provide `sync` flag in `StateRequest` and if it is ready to execute, fire
it synchronously.
## 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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