JingGe opened a new pull request #19120:
URL: https://github.com/apache/flink/pull/19120
## What is the purpose of the change
This is the follow-up PR of #18825. We found that the new sink v2 interface
will have a wrong numRecordsOut metric for the sink writers. We send a fixed
number of records to the source, but the numRecordsOut of the sink continues to
increase by the time.
## Brief change log
- replace the records out counter with the records send counter in
`FileWriter`
- replace the records and byte out counter with the records and byte send
counter in `AsyncSinkWriter`
- migrate `FileWriterTest` and `AsyncSinkWriterTest` to AssertJ
## Verifying this change
This change is already covered by existing tests, such as `FileWriterTest`
and `AsyncSinkWriterTest`.
## 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**)
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