Myasuka opened a new pull request #15091:
URL: https://github.com/apache/flink/pull/15091
## What is the purpose of the change
Count the get/put/seek/next/writeBatch latency of RocksDB as metrics.
## Brief change log
Track access latency on client side.
1. Introduce 'state.backend.rocksdb.latency-track-enabled' option to switch
whether enable this feature.
1. Introduce 'state.backend.rocksdb.latency-track-sample-interval' option to
change the sample interval.
1. Introduce 'state.backend.rocksdb.latency-track-sliding-window' option to
tune the sliding window size of histogram metrics.
If want to track the latency, just switch
state.backend.rocksdb.latency-track-enabled to true.
## Verifying this change
This change added tests and can be verified as follows:
`RocksDBLatencyMetricsTest` and `RocksDBAccessMetricTest`
## 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): should not be
- 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? no
- If yes, how is the feature documented? not applicable
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