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Date: Wed, 24 Oct 2012 12:58:23 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-4229) Counter names' memory usage can
 be decreased by interning
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-4229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13483195#comment-13483195 ] 

Hudson commented on MAPREDUCE-4229:
-----------------------------------

Integrated in Hadoop-Hdfs-trunk #1205 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1205/])
    Updating credits for MAPREDUCE-4229. (Revision 1401493)
MAPREDUCE-4229. Intern counter names in the JT (bobby via daryn) (Revision 1401473)
MAPREDUCE-4229. Intern counter names in the JT (bobby via daryn) (Revision 1401467)

     Result = FAILURE
daryn : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1401493
Files : 
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt

daryn : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1401473
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/StringInterner.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestStringInterner.java

daryn : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1401467
Files : 
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/jobhistory/EventReader.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/jobhistory/JobHistoryParser.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/util/CountersStrings.java

                
> Counter names' memory usage can be decreased by interning
> ---------------------------------------------------------
>
>                 Key: MAPREDUCE-4229
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4229
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobtracker
>    Affects Versions: 1.0.2, 3.0.0, 2.0.2-alpha
>            Reporter: Todd Lipcon
>            Assignee: Miomir Boljanovic
>             Fix For: 3.0.0, 2.0.3-alpha, 0.23.5
>
>         Attachments: MAPREDUCE-4229-branch-0.23.patch, MAPREDUCE-4229-branch-0.23.patch, MAPREDUCE-4229.patch, mr-4229.txt, MR-4229.txt
>
>
> In our experience, most of the memory in production JTs goes to storing counter names (String objects and character arrays). Since most counter names are reused again and again, it would be a big memory savings to keep a hash set of already-used counter names within a job, and refer to the same object from all tasks.

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