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https://issues.apache.org/jira/browse/YARN-2369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dustin Cote updated YARN-2369:
------------------------------
    Attachment: YARN-2369-1.patch

I like the second idea where the user should explicitly append to the variable. 
 I think we can do this just by removing the code to append and just replace 
the entire variable every time we get an update.  I'm going to try this out, 
but figured I'd attach the code change in case I'm missing something obvious.

> 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
>
>
> 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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