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Date: Fri, 20 Mar 2009 11:50:50 -0700 (PDT)
From: "Klaas Bosteels (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5528) Binary partitioner
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    [ https://issues.apache.org/jira/browse/HADOOP-5528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683986#action_12683986 ] 

Klaas Bosteels commented on HADOOP-5528:
----------------------------------------

The meaning is different yes. Specifying _left = x_ means that the _x_ leftmost bytes will not be taken into account and, simlarily, specifying _right = y_ means that the _y_ rightmost bytes will not be taken into account. So the right offset is not relative to the first byte of the array, but to the last one.

> Binary partitioner
> ------------------
>
>                 Key: HADOOP-5528
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5528
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: mapred
>            Reporter: Klaas Bosteels
>            Assignee: Klaas Bosteels
>         Attachments: HADOOP-5528.patch
>
>
> It would be useful to have a {{BinaryPartitioner}} that partitions {{BinaryComparable}} keys by hashing a configurable part of the bytes array corresponding to each key.

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