[jira] [Updated] (FLINK-26757) change the default value of state.backend.rocksdb.restore-overlap-fraction-threshold

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-26757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated FLINK-26757:
-----------------------------------
    Labels: pull-request-available  (was: )

> 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
>    Affects Versions: 1.16.0
>            Reporter: Yanfei Lei
>            Assignee: Yanfei Lei
>            Priority: Major
>              Labels: pull-request-available
>         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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