yunfengzhou-hub opened a new pull request, #24272:
URL: https://github.com/apache/flink/pull/24272
## What is the purpose of the change
This pull request adds support for EndOfStreamTrigger and
isOutputOnlyAfterEndOfStream operator attribute to optimize task deployment.
## Brief change log
- Introduces OperatorAttributes with isOutputOnlyAfterEndOfStream attribute
- Schedules operators with isOutputOnlyAfterEndOfStream=true to run in
blocking mode
- Make WindowOperator and StreamSortOperator return
isOutputOnlyAfterEndOfStream=true in certain cases
## Verifying this change
- This change adds unit tests for OperatorAttributes and the corresponding
blocking mode changes.
- The change on WindowOperator and StreamSortOperator is covered by existing
tests.
## 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)`: yes
- The serializers: no
- The runtime per-record code paths (performance sensitive): yes
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: yes
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? yes
- If yes, how is the feature documented? JavaDocs
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