[jira] Created: (HADOOP-6100) Undefined variable is treated as string.

["Suman Sehgal (JIRA)" <ji...@apache.org>]

Undefined variable is treated as string.
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                 Key: HADOOP-6100
                 URL: https://issues.apache.org/jira/browse/HADOOP-6100
             Project: Hadoop Common
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.20.0
            Reporter: Suman Sehgal
            Priority: Minor


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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