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https://issues.apache.org/jira/browse/MAPREDUCE-736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Balaji Rajagopalan updated MAPREDUCE-736:
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Attachment: hadoop_env.txt
I modified the unit test case, run this test to make it fixes the original
issue with mapred.child.env
> Undefined variable is treated as string.
> ----------------------------------------
>
> Key: MAPREDUCE-736
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-736
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Suman Sehgal
> Priority: Minor
> Attachments: hadoop_env.txt
>
>
> This issue is related to HADOOP-2838.
> For X=$X:Y : Append Y to X (which should be taken from the tasktracker) , if
> we append to an undefined variable then value for undefined variable should
> be displayed as blank
> e.g. NEW_PATH=$NEW_PATH2:/tmp should be displayed as
> ":/tmp" in child's environment
> while that variable is being displayed as a string ("$NEW_PATH2:/tmp") in the
> environemnt.
> This is happening in case of default task-controller only. This scenario
> works fine with linux task-controller.
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