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https://issues.apache.org/jira/browse/HBASE-11562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14187404#comment-14187404
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Hudson commented on HBASE-11562:
--------------------------------
SUCCESS: Integrated in HBase-TRUNK #5711 (See
[https://builds.apache.org/job/HBase-TRUNK/5711/])
HBASE-11562 CopyTable should provide an option to shuffle the mapper tasks
(Jean-Marc Spaggiari) (stack: rev 64b6109ce917a47e4fa4b88cdb800bcc7a228484)
* hbase-server/src/main/java/org/apache/hadoop/hbase/mapreduce/CopyTable.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/mapreduce/TableInputFormat.java
> CopyTable should provide an option to shuffle the mapper tasks
> --------------------------------------------------------------
>
> Key: HBASE-11562
> URL: https://issues.apache.org/jira/browse/HBASE-11562
> Project: HBase
> Issue Type: Bug
> Components: mapreduce
> Affects Versions: 0.99.0, 0.94.20, 0.98.4
> Reporter: Jean-Marc Spaggiari
> Assignee: Jean-Marc Spaggiari
> Fix For: 2.0.0, 0.99.2
>
> Attachments: HBASE-11562-v0-trunk.patch, HBASE-11562-v2-trunk.patch,
> HBASE-11562-v3-trunk.patch
>
>
> When doing a copy table from a table with a lot of regions to a table to way
> less regions, on a cluster with limited number of mappers, since map tasks
> are ordered by key, tasks will first run for the few first regions and will
> hotspot a single region server on the destination side.
> To avoid this, we should submit the map tasks in a random order.
> This JIRA is to add this option to CopyTable and TableInputFormat
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