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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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Jean-Marc Spaggiari updated HBASE-11562:
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Status: Patch Available (was: Open)
> 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: 0.98.4, 0.94.20, 0.99.0
> Reporter: Jean-Marc Spaggiari
> Assignee: Jean-Marc Spaggiari
> Attachments: HBASE-11562-v0-trunk.patch, HBASE-11562-v1-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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