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https://issues.apache.org/jira/browse/MAPREDUCE-4771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490838#comment-13490838
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Jason Lowe commented on MAPREDUCE-4771:
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The regression from 1.x occurs because KeyFieldBasedPartitioner implements
Configurable and JobConfigurable. In 1.x it only implemented JobConfigurable,
so it was only configured once.
> KeyFieldBasedPartitioner not partitioning properly when configured
> ------------------------------------------------------------------
>
> Key: MAPREDUCE-4771
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4771
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.3, 2.0.1-alpha
> Reporter: Jason Lowe
> Assignee: Jason Lowe
>
> Relative to Hadoop 0.20/1.x, KeyFieldBasedPartitioner is not distributing
> across partitions properly when configured. This is related to the
> double-configure issue as described in HADOOP-7425. KeyFieldBasedPartitioner
> is getting configured twice, and that ends up duplicating the keyspecs and
> causing the keys to be hashed twice.
> KeyFieldBasedPartitioner should not duplicate keyspecs when configured twice.
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