Dustin Cote updated YARN-2369:
    Attachment: YARN-2369-7.patch

[~jlowe] sorry this took so long, I got sidetracked with other projects!  I 
think I've now included your suggestions in v7 of this patch and there are a 
couple of checkstyle warnings as you might have expected.  If there's anything 
missing from this please let me know :)

> 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
>         Attachments: YARN-2369-1.patch, YARN-2369-2.patch, YARN-2369-3.patch, 
> YARN-2369-4.patch, YARN-2369-5.patch, YARN-2369-6.patch, YARN-2369-7.patch
> 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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