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Posted to common-issues@hadoop.apache.org by "Thomas Graves (Commented) (JIRA)" <ji...@apache.org> on 2012/02/06 22:59:00 UTC
[jira] [Commented] (HADOOP-7761) Improve performance of raw
comparisons
[ https://issues.apache.org/jira/browse/HADOOP-7761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201649#comment-13201649 ]
Thomas Graves commented on HADOOP-7761:
---------------------------------------
I think this should be merged into branch 0.23.
> 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, performance, util
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.24.0
>
> Attachments: hadoop-7761.txt, hadoop-7761.txt, hadoop-7761.txt, 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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