FAQ
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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postedJun 23, '09 at 11:26a
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