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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-5490) MapReduce doesn't set the environment variable for children processes
Date Wed, 06 May 2015 03:36:18 GMT

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

Allen Wittenauer updated MAPREDUCE-5490:
----------------------------------------
    Labels: BB2015-05-TBR  (was: )

> 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
>              Labels: BB2015-05-TBR
>         Attachments: MAPREDUCE-5490.patch, 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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