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Date: Fri, 20 Mar 2009 13:08:50 -0700 (PDT)
From: "Owen O'Malley (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=12684013#action_12684013 ] 

Owen O'Malley commented on HADOOP-5528:
---------------------------------------

I understand now. right is defined as bytes from the right to ignore. Unfortunately that means you *can't* use it to pick up bytes 4-8 if you don't know the length. How about using python style offsets where negative numbers means count from the right. That will allow a lot more flexibility.

0 = start of bytes
1 = after first byte
-2 = before last byte
-1 = end of bytes

So left=4, right=8 would use bytes 4-8 from the right.
Left=-5, right=-1 would use the last 4 bytes.

> 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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