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From "Hudson (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 06:53:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14530035#comment-14530035
] 

Hudson commented on HBASE-12957:
--------------------------------

FAILURE: Integrated in HBase-1.0 #902 (See [https://builds.apache.org/job/HBase-1.0/902/])
HBASE-12957 region_mover#isSuccessfulScan may be extremely slow on region with lots of expired
data. (hongyu bi) (larsh: rev be397afc15f85be14dfb6a13473491fbe04ff5fe)
* bin/region_mover.rb


> 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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