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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5528) Binary partitioner
Date Thu, 26 Mar 2009 21:49:50 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated HADOOP-5528:
----------------------------------

    Status: Open  (was: Patch Available)

This is looking good.

* Instead of the Indexer classes, this can use {{(index + key.getLength()) % key.getLength()}}
for both positive and negative values
* The right index should probably default to \-1
* It's fair to assume that a user specifying an offset into binary data is certain that its
length can accommodate it, so the max/min games preventing exceptions are probably too permissive.
* The semantics as written for the unit tests confuse me. For example, given
{noformat}
x = { 1, 2, 3, 4, 5 };
y = { 6, 2, 3, 7, 8 };
{noformat}
The test asserts that the left, right offsets {{1, -2}} and {{1, 3}} refer to the same elements,
but this seems incorrect, because then {{3, -1}} would not refer to the last two bytes, but
to the same byte. There would be no way to specify "the last n" bytes because the last byte
is unaddressable.

> 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, HADOOP-5528.patch, HADOOP-5528.patch, 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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