zhuzhurk opened a new pull request #13205:
URL: https://github.com/apache/flink/pull/13205
## What is the purpose of the change
This PR changes regions building to merge cyclic dependent pipelined regions
into one region.
This is to avoid scheduling deadlocks due to cyclic dependencies.
More details see FLINK-17330.
## Brief change log
- *Added StronglyConnectedComponentsComputeUtils to find out cyclic
dependent regions*
- *Changed PipelinedRegionComputeUtil to merge cyclic dependent pipelined
regions into one region*
## Verifying this change
- *Added UT StronglyConnectedComponentsComputeUtilsTest*
- *Added test case in PipelinedRegionComputeUtilTest to verify regions on
the same cycles are merged*
## 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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