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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7761) Improve performance of raw comparisons
Date Thu, 20 Oct 2011 17:34:11 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HADOOP-7761:
--------------------------------

    Status: Patch Available  (was: Open)
    
> 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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