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https://issues.apache.org/jira/browse/MAPREDUCE-5490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13904308#comment-13904308
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Jinghui Wang commented on MAPREDUCE-5490:
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Added patch based on trunk. Making exporting the classpath as a configurable
option in case some people are still used to the seeing it under ps -ef. Also
have checked the outputted script that starts the Child manually and looks
fine. An unit test was also added here.
> 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: 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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