becketqin opened a new pull request #13920:
URL: https://github.com/apache/flink/pull/13920
## What is the purpose of the change
This patch does the following:
* Moved the `MetricNames` from flink-runtime to flink-core and added the
metrics defined in FLIP-33.
* Improved the `SourceReaderBase` API to allow additional information to be
passed from the `SplitReader` to `RecordEmitter`. So that the implementations
do not have to put some common information in the records themselves.
* Report some of the metrics by default.
Metrics implemented by the SourceOperator / ReaderOutput:
1. currentEmitEventTimeLag (at a sampling frequency of once per second)
2. watermarkLag
Metrics implemented in the `SourceReaderBase` (can be overridden by
individual implementations):
1. numRecordsIn / numRecordsInPerSecond
2. sourceIdleTime
Metrics left for individual implementations to report in `SplitReader` /
`RecordEmitter` :
1. numBytesIn / numBytesInPerSecond
2. currentFetchEventTime
3. pendingBytes
4. pendingRecords
5. numRecordsInErrors (errors in SplitReader and record emitter)
## Brief change log
* Moved the `MetricNames` from flink-runtime to flink-core and added the
metrics defined in FLIP-33.
* Improved the `SourceReaderBase` API to allow additional information to be
passed from the `SplitReader` to `RecordEmitter`. So that the implementations
do not have to put some common information in the records themselves.
* Report some of the metrics by default.
## Verifying this change
Unit tests have been added to test the metrics reporting and additional
information passing between `SplitReader` and `RecordEmitter`.
## 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/Mesos, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (yes)
- If yes, how is the feature documented? (docs / JavaDocs)
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