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

["Owen O'Malley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Owen O'Malley updated MAPREDUCE-5490:
-------------------------------------

    Attachment: mr-5490.patch

This patch also sets HADOOP_CLASSPATH so that if the bin/hadoop command is invoked my a mapreduce task, it will have the task's classpath.

> 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
>         Attachments: mr-5490.patch, mr-5490.patch
>
>
> 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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