Dustin Cote commented on YARN-2369:

It turns out my initial idea causes other problems with the application master, 
so I'm going up the call chain a bit to see what's going on.  Seems like it 
breaks org.apache.hadoop.mapreduce.v2.util.MRApps.java#addToEnvironment 
expectations at the moment, so maybe there's something else that needs to be 

> Environment variable handling assumes values should be appended
> ---------------------------------------------------------------
>                 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
>            Assignee: Dustin Cote
> 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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