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From "Ravi Prakash (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3087) CLASSPATH not the same after MAPREDUCE-2880
Date Wed, 05 Oct 2011 18:04:30 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121297#comment-13121297
] 

Ravi Prakash commented on MAPREDUCE-3087:
-----------------------------------------

No No Hadoop QA. Please don't be cross with me. I like you. I really do.

The trouble you see is, that MRApps:setMRFrameworkClasspath() queries the classloader for
mrapp-generated-classpath. If the CLASSPATH doesn't have the mr-app.jar, reader (MRApps.java:182)
throws an NPE (because classpathFileStream is null). So the classpath MUST have a valid jar
containing mrapp-generated-classpath. When I modified pom.xml to include hadoop-mapreduce-client-app,
a circular dependency was introduced. 

So should I really go through the trouble of having a test-jar containing mrapp-generated-classpath
or will a nice brave committer approve my one line change? That would be the first patch.
                
> CLASSPATH not the same after MAPREDUCE-2880
> -------------------------------------------
>
>                 Key: MAPREDUCE-3087
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3087
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Ravi Prakash
>            Assignee: Ravi Prakash
>             Fix For: 0.23.0
>
>         Attachments: MAPREDUCE-3087.patch, MAPREDUCE-3087.patch, notworking.classpath.uniq,
working.classpath.uniq
>
>
> After MAPREDUCE-2880, my classpath was missing key jar files. 

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