clownxc opened a new pull request, #22555:
URL: https://github.com/apache/flink/pull/22555
## What is the purpose of the change
Currently, the sources need to set
`execution.batch.adaptive.auto-parallelism.default-source-parallelism` in the
adaptive batch scheduler mode, otherwise, the source parallelism is only 1 by
default. A better solution might be set as the default execution parallelism if
no user configured.
## Brief change log
Modified the default value of source-parallelism to be more reasonable.
## Verifying this change
This change is already covered by existing tests, such as
`AdaptiveBatchSchedulerTest`
## 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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