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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7761) Improve performance of raw comparisons
Date Thu, 20 Oct 2011 17:34:10 GMT
Improve performance of raw comparisons
--------------------------------------

                 Key: HADOOP-7761
                 URL: https://issues.apache.org/jira/browse/HADOOP-7761
             Project: Hadoop Common
          Issue Type: Improvement
          Components: io, util
    Affects Versions: 0.23.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
         Attachments: hadoop-7761.txt

Guava has a nice implementation of lexicographical byte-array comparison that uses sun.misc.Unsafe
to compare unsigned byte arrays long-at-a-time. Their benchmarks show it as being 2x more
CPU-efficient than the equivalent pure-Java implementation. We can easily integrate this into
WritableComparator.compareBytes to improve CPU performance in the shuffle.

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