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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2855) ResourceBundle lookup during counter name resolution takes a lot of time
Date Tue, 28 Feb 2012 01:37:49 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13217806#comment-13217806
] 

Hudson commented on MAPREDUCE-2855:
-----------------------------------

Integrated in Hadoop-Common-0.23-Commit #605 (See [https://builds.apache.org/job/Hadoop-Common-0.23-Commit/605/])
    MAPREDUCE-2855. Passing a cached class-loader to ResourceBundle creator to minimize counter
names lookup time. Contributed by Siddarth Seth.
svn merge --ignore-ancestry -c 1294436 ../../trunk (Revision 1294437)

     Result = SUCCESS
vinodkv : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1294437
Files : 
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/util/ResourceBundles.java

                
> ResourceBundle lookup during counter name resolution takes a lot of time
> ------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2855
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2855
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Siddharth Seth
>              Labels: mrv2
>         Attachments: MR2855.txt
>
>
> Loading a job status page in trunk takes a lot of time, and it seems like most of the
time is spent resolving counter names. Looking through the JDK source, ResourceBundle.getBundle(String)
ends up calling getClassContext() which is not very efficient. I think if we pass our own
classloader manually it will be faster. In Counters.incrAllCounters, we may also be able to
avoid setting the counter name if one is already set.

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