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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
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Owen O'Malley commented on HADOOP-5528:
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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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