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https://issues.apache.org/jira/browse/HBASE-11562?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-11562:
--------------------------
Resolution: Fixed
Fix Version/s: 0.99.2
2.0.0
Release Note: Adds new 'shuffle' option to CopyTable that shuffles the
maps order; use if you need some random on what tasks of a table copy run when.
Hadoop Flags: Reviewed
Status: Resolved (was: Patch Available)
Committed to branch-1+ Thanks [~jmspaggi]
> 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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