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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