Yanfei Lei created FLINK-26757:
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Summary: change the default value of
state.backend.rocksdb.restore-overlap-fraction-threshold
Key: FLINK-26757
URL: https://issues.apache.org/jira/browse/FLINK-26757
Project: Flink
Issue Type: Improvement
Components: Runtime / State Backends
Reporter: Yanfei Lei
Attachments: 截屏2022-03-21 上午11.50.28.png
`state.backend.rocksdb.restore-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.
In theory, setting the default value to 0 is most suitable, since
`deleteRange()` takes less time than creating a new RocksDB instance and then
scan-and-put the records. In fact, we also have some experimental data that the
default value of 0 is more suitable. Here is a comparison of initialization
times for different thresholds, we can see that the default value to 0 takes
less time.
!截屏2022-03-21 上午11.50.28.png!
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