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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12957) region_mover#isSuccessfulScan may be extremely slow on region with lots of expired data
Date Wed, 06 May 2015 05:37:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14529961#comment-14529961
] 

Lars Hofhansl commented on HBASE-12957:
---------------------------------------

Pushed to 1.0.2 (not released, yet, so that's fine). All good now.

> region_mover#isSuccessfulScan may be extremely slow on region with lots of expired data
> ---------------------------------------------------------------------------------------
>
>                 Key: HBASE-12957
>                 URL: https://issues.apache.org/jira/browse/HBASE-12957
>             Project: HBase
>          Issue Type: Improvement
>          Components: scripts
>            Reporter: hongyu bi
>            Assignee: hongyu bi
>            Priority: Minor
>             Fix For: 2.0.0, 1.1.0, 0.98.11, 1.0.2
>
>         Attachments: HBASE-12957-v0.patch
>
>
> region_mover will call isSuccessfulScan when region has moved to make sure it's healthy,
however , if the moved region has lots of expired data region_mover#isSuccessfulScan will
take a long time to finish ,that may even exceed "lease timeout".So I made isSuccessfulScan
a get-like scan to achieve faster response in that case. 
> workaround:before graceful_stop/rolling_restart ,call major_compact on the table with
small TTL



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