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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-2369-3.patch

[~vinodkv] here's v3 of the patch.  I've got a new unit test in this one and 
I'm using MRJobConfig now for the property (now with a new and improved name).  
I think I've trimmed down the lines, but if something looks misplaced please 
let me know.  Thanks!

> 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
>
>
> 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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