Jason Lowe created YARN-2369:

             Summary: Environment variable handling assumes values should be 
                 Key: YARN-2369
                 URL: https://issues.apache.org/jira/browse/YARN-2369
             Project: Hadoop YARN
          Issue Type: Bug
    Affects Versions: 2.2.0
            Reporter: Jason Lowe

When processing environment variables for a container context the code assumes 
that the value should be appended to any pre-existing value in the environment. 
 This may be desired behavior for handling path-like environment variables such 
as PATH, LD_LIBRARY_PATH, CLASSPATH, etc. but it is a non-intuitive and harmful 
way to handle any variable that does not have path-like semantics.

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