godfreyhe opened a new pull request, #21777:
URL: https://github.com/apache/flink/pull/21777
## What is the purpose of the change
*Fix maxParallelism is not forced to 1 after global partitioner.
Currently, the parallelism of global sort is set as 1, but the max
parallelism is not set because ExecNodeBase#inputsContainSingleton does not
work for global sort. This works fine for the default scheduler, but may occur
wrong result if adaptive batch scheduler changes the global sort parallelism.*
## Brief change log
- *Make sure all Batch Exec Nodes implements
SingleTransformationTranslator or MultipleTransformationTranslator*
- *set MaxParallelism to 1 if inputs has global partitioner in
ExecNodeBase*
## Verifying this change
This change added tests and can be verified as follows:
- *Extended ParallelismSettingTest to verify the changes*
## 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, 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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