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https://issues.apache.org/jira/browse/MAPREDUCE-4068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13433363#comment-13433363
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Robert Kanter commented on MAPREDUCE-4068:
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The TestTaskTrackerLocalization file looks like it tests this, but only for mr1
> Jars in lib subdirectory of the submittable JAR are not added to the classpath
> ------------------------------------------------------------------------------
>
> Key: MAPREDUCE-4068
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4068
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 2.0.0-alpha
> Reporter: Ahmed Radwan
> Priority: Blocker
> Fix For: 2.2.0-alpha
>
>
> Prior to hadoop 0.23, users could add third party jars to the lib
> subdirectory of the submitted job jar and they become available in the task's
> classpath. I see this functionality was in TaskRunner.java, but I can't see
> similar functionality in hadoop 0.23 (neither in MapReduceChildJVM.java nor
> other places).
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