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Posted to mapreduce-dev@hadoop.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2013/08/31 01:13:51 UTC

[jira] [Created] (MAPREDUCE-5490) MapReduce doesn't set the environment variable for children processes

Owen O'Malley created MAPREDUCE-5490:
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             Summary: MapReduce doesn't set the environment variable for children processes
                 Key: MAPREDUCE-5490
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5490
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 1.2.1
            Reporter: Owen O'Malley
            Assignee: Owen O'Malley


Currently, MapReduce uses the command line argument to pass the classpath to the child. This breaks if the process forks a child that needs the same classpath. Such a case happens in Hive when it uses map-side joins. I propose that we make MapReduce in branch-1 use the CLASSPATH environment variable like YARN does.

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