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Date: Tue, 7 Feb 2012 12:49:03 +0000 (UTC)
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Subject: [jira] [Commented] (HADOOP-7761) Improve performance of raw
 comparisons
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    [ https://issues.apache.org/jira/browse/HADOOP-7761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202332#comment-13202332 ] 

Hudson commented on HADOOP-7761:
--------------------------------

Integrated in Hadoop-Hdfs-0.23-Build #162 (See [https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/162/])
    HADOOP-7761. svn merge -c 1189613 from trunk

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1241266
Files : 
* /hadoop/common/branches/branch-0.23
* /hadoop/common/branches/branch-0.23/hadoop-common-project
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-auth
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/docs
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/FastByteComparisons.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/WritableComparator.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/core
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/java
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/native
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/datanode
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/secondary
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/test/hdfs
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/bin
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/conf
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-examples
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-site
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-site/src/site/apt
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/c++
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/block_forensics
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/build-contrib.xml
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/build.xml
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/data_join
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/eclipse-plugin
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/index
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/vaidya
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/examples
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/fs
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/hdfs
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/ipc
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/webapps/job
* /hadoop/common/branches/branch-0.23/hadoop-project
* /hadoop/common/branches/branch-0.23/hadoop-project/src/site

                
> 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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