Gera Shegalov created YARN-4789:
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             Summary: Provide helpful exception for non-PATH-like conflict with 
admin.user.env
                 Key: YARN-4789
                 URL: https://issues.apache.org/jira/browse/YARN-4789
             Project: Hadoop YARN
          Issue Type: Bug
    Affects Versions: 2.7.2
            Reporter: Gera Shegalov
            Assignee: Gera Shegalov


Environment variables specified in mapreduce.admin.user.env are supposed to be 
paths (class, shell, library) and they can be merged with the user-provided 
values. However, it's also possible that the cluster admins specify some 
non-PATH-like variable such as JAVA_HOME. In this case if there is the same 
variable provided by the user, we'll get a concatenation that does not make 
sense and is difficult to debug.




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