1996fanrui opened a new pull request, #26931:
URL: https://github.com/apache/flink/pull/26931
## What is the purpose of the change
Job cannot be recovered from UC(unaligned checkpoint) after rescaling, and
the exception is:
```
java.lang.UnsupportedOperationException: Cannot rescale the given pointwise
partitioner.
Did you change the partitioner to forward or rescale?
It may also help to add an explicit shuffle().
```
When one upstream task has multiple output exchanges, which including UC
SUPPORTED exchanges(likes hash or rebalance) and at least one UC UNSUPPORTED
exchanges(likes Forward or rescale).
Or when one downstream task has multiple input exchanges, which including UC
SUPPORTED exchanges(likes hash or rebalance) and at least one UC UNSUPPORTED
exchanges(likes Forward or rescale).
See more from FLINK-38267
## Brief change log
- [FLINK-38267] Only call channel state rescaling logic for exchange with
channel state to avoid UnsupportedOperationException
- [FLINK-38267][checkpoint] Refactor hasInputState and hasOutputState
related logic in TaskStateAssignment
## Verifying this change
Doing
## 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
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