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https://issues.apache.org/jira/browse/HADOOP-4143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629896#action_12629896
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Chris Douglas commented on HADOOP-4143:
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Of course, this would also permit jobs that use raw partitioners to use only 12
bytes per record instead of 16, with additional cost to the compare during the
sort (probably not worthwhile)
> Support for a "raw" Partitioner that partitions based on the serialized key
> and not record objects
> --------------------------------------------------------------------------------------------------
>
> Key: HADOOP-4143
> URL: https://issues.apache.org/jira/browse/HADOOP-4143
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Reporter: Chris Douglas
> Attachments: 4143-0.patch
>
>
> For some partitioners (particularly those using comparators to classify
> keys), it would be helpful if one could specify a "raw" partitioner that
> would receive the serialized version of the key rather than the object
> emitted from the map.
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