lindong28 opened a new pull request, #21579:
URL: https://github.com/apache/flink/pull/21579
## What is the purpose of the change
Improve Flink performance by reducing the average depth of the call stack
needed to produce a record.
## Brief change log
- Added interface `ListOutput`. `ListOutput` extends `Output` and provides
API to add listeners on an existing output instance.
- Updated `AbstractStreamOperator` and `AbstractStreamOperatorV2` to add
`CountingOutput` as listeners on the underlying output rather than as wrapper
around the underlying output, if the underlying output implements `ListOutput`.
## Verifying this change
We will add the benchmark results later.
## 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): yes
- 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
- If yes, how is the feature documented? not applicable
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