[jira] [Commented] (YARN-1554) add an env variable for the YARN AM classpath

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-1554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13860131#comment-13860131 ] 

Steve Loughran commented on YARN-1554:
--------------------------------------

As  noted in {{org.apache.hadoop.yarn.applications.distributedshell.Client}}:

{code}
    // At some point we should not be required to add 
    // the hadoop specific classpaths to the env. 
    // It should be provided out of the box. 
    // For now setting all required classpaths including
    // the classpath to "." for the application jar
{code}

> 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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