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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, 04 Feb 2015 05:10:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14304652#comment-14304652
] 

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

FAILURE: Integrated in HBase-TRUNK #6084 (See [https://builds.apache.org/job/HBase-TRUNK/6084/])
HBASE-12957 region_mover#isSuccessfulScan may be extremely slow on region with lots of expired
data (Hongyu Bi) (tedyu: rev 4388fed83028325cfe75fc0a8787183db2a58855)
* bin/region_mover.rb
* hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionServerHostname.java


> 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
>
>         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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