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Date: Fri, 10 Sep 2010 21:17:33 -0400 (EDT)
From: "Hong Tang (JIRA)" <jira@apache.org>
To: mapreduce-dev@hadoop.apache.org
Subject: [jira] Created: (MAPREDUCE-2061) child environment substitution is
 broken
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child environment substitution is broken
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                 Key: MAPREDUCE-2061
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2061
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Hong Tang


TaskRunner.getVMEnvironment is still broken in a couple of ways even after HADOOP-5981:
* It does not recognize ${VAR} notation. This is necessary if we have both "VAR" and "VAR_1" existent, and it becomes ambiguous whether $VAR_1 means appending _1 following $VAR, or simply taking the value of $VAR_1
* It tries to do lazy-binding except for self-referencing like X=$X:Y. This would cause some unexpected behavior. For instance, if I specify "A=$LD_LIBRARY_PATH:xxx", A would be shown as ":xxx", while if I specify "LD_LIBRARY_PATH=$Z:xxx,Z=$LD_LIBRARY_PATH:yyy", Z would be come the actual value of LD_LIBRARY_PATH + ":yyy" (and LD_LIBRARY_PATH is not affected at all). I think we should support eager binding (and we can support lazy binding later through quoting or escaping).


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