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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8790) Improve performance for recovery from incremental checkpoint
Date Tue, 05 Jun 2018 10:29:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16501570#comment-16501570

ASF GitHub Bot commented on FLINK-8790:

Github user StefanRRichter commented on the issue:

    LGTM 👍 Very nice work. I will merge it with some very minor touchups.

> 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`
>  `data insertion loop` and also help us get rid of traversing the useless record.

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