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From "Jean-Marc Spaggiari (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11562) CopyTable should provide an option to shuffle the mapper tasks
Date Wed, 23 Jul 2014 18:57:41 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11562?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jean-Marc Spaggiari updated HBASE-11562:
----------------------------------------

    Status: Open  (was: Patch Available)

> 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-v2-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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