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Posted to dev@hbase.apache.org by "Jean-Marc Spaggiari (JIRA)" <ji...@apache.org> on 2014/07/22 05:39:38 UTC
[jira] [Created] (HBASE-11562) CopyTable should provide an option
to shuffle the mapper tasks
Jean-Marc Spaggiari created HBASE-11562:
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Summary: 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
Reporter: Jean-Marc Spaggiari
Assignee: Jean-Marc Spaggiari
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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