zhijiangW opened a new pull request #12163:
URL: https://github.com/apache/flink/pull/12163
## What is the purpose of the change
Currently we rely on whether unaligned checkpoint is enabled to determine
whether to read recovered states during task startup, then it will block the
requirements of recovery from previous unaligned states even though the current
mode is aligned.
We can make `ChannelStateReader` provide the hint whether there are any
channel states to be read during startup, then we will never lose any chances
to recover from them.
## Brief change log
- Provide `ChannelStateReader#hasStates` interface methods and implements it
in related instances.
- Adjust the condition in `StreamTask#beforeInvoke` to reuse the new hint.
## Verifying this change
new unit test in `StreamTaskTest#testBeforeInvokeWithoutChannelStates`.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / **no** /
don't know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (**not applicable** / docs /
JavaDocs / not documented)
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