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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2022/03/16 07:52:35 UTC

[GitHub] [flink] fredia opened a new pull request #19106: [FLINK-26560][StateBackends] Make the threshold of the overlap fraction of incremental restoring configurable

fredia opened a new pull request #19106:
URL: https://github.com/apache/flink/pull/19106

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## What is the purpose of the change

Currently, the threshold of the overlap fraction of incremental restoring `OVERLAP_FRACTION_THRESHOLD` is a hard-coded, fixed value.
`OVERLAP_FRACTION_THRESHOLD` is used to control how to restore a state handle, different thresholds can affect the performance of restoring. The behavior of deletion in restoring has been changed after [FLINK-21321](https://issues.apache.org/jira/browse/FLINK-21321), the old threshold no longer fits the current situation.

To make it easier to modify the threshold according to different situations, changing `OVERLAP_FRACTION_THRESHOLD` to be configurable is suggested.

## Brief change log

- Add `RESTORE_OVERLAP_FRACTION_THRESHOLD` into RocksDBConfigurableOptions.

## Verifying this change

This change added tests and can be verified as follows:

- Add UT cases in RocksDBStateBackendConfigTest#testConfigurableOptionsFromConfig().

## 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**)
- If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

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