[
https://issues.apache.org/jira/browse/MAPREDUCE-2061?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Allen Wittenauer resolved MAPREDUCE-2061.
-----------------------------------------
Resolution: Duplicate
Duping to a more modern jira.
> child environment substitution is broken
> ----------------------------------------
>
> 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).
--
This message was sent by Atlassian JIRA
(v6.2#6252)
