Steve Loughran commented on YARN-1554:

..it's a proposed solution to YARN-973 : that the NM could set up the env var 
so that clients don't need to know it

> add an env variable for the YARN AM classpath
> ---------------------------------------------
>                 Key: YARN-1554
>                 URL: https://issues.apache.org/jira/browse/YARN-1554
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager
>    Affects Versions: 2.2.0
>            Reporter: Steve Loughran
>            Priority: Minor
> Currently YARN apps set up their classpath via the default value 
> {{YarnConfiguration.DEFAULT_YARN_APPLICATION_CLASSPATH}} or an overridden 
> property {{yarn.application.classpath}}. 
> If you don't have the classpath right, the AM won't start up. This means the 
> client needs to be explicitly configured with the CP.
> If the node manager exported the classpath property via an env variable 
> {{YARN_APPLICATION_CLASSPATH}}, then the classpath could be set up in the AM 
> simply by referencing that property, rather than hoping its setting is in 
> sync. 

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