[jira] [Closed] (FLINK-8790) Improve performance for recovery from incremental checkpoint

["Stefan Richter (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-8790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Richter closed FLINK-8790.
---------------------------------
    Resolution: Fixed

Merged in:
master: bbf7ff2273

> Improve performance for recovery from incremental checkpoint
> ------------------------------------------------------------
>
>                 Key: FLINK-8790
>                 URL: https://issues.apache.org/jira/browse/FLINK-8790
>             Project: Flink
>          Issue Type: Improvement
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.5.0
>            Reporter: Sihua Zhou
>            Assignee: Sihua Zhou
>            Priority: Major
>             Fix For: 1.6.0
>
>
> When there are multi state handle to be restored, we can improve the performance as follow:
> 1. Choose the best state handle to init the target db
> 2. Use the other state handles to create temp db, and clip the db according to the target key group range (via rocksdb.deleteRange()), this can help use get rid of the `key group check` in 
>  `data insertion loop` and also help us get rid of traversing the useless record.



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