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https://issues.apache.org/jira/browse/HADOOP-7761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13137139#comment-13137139
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Hudson commented on HADOOP-7761:
--------------------------------
Integrated in Hadoop-Hdfs-trunk #845 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/845/])
HADOOP-7761. Improve the performance of raw comparisons. Contributed by
Todd Lipcon.
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1189613
Files :
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/FastByteComparisons.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/WritableComparator.java
> 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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