[jira] [Reopened] (MAPREDUCE-4422) YARN_APPLICATION_CLASSPATH needs a documented default value in YarnConfiguration

["Arun C Murthy (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4422?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arun C Murthy reopened MAPREDUCE-4422:
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Uh, Harsh/Ahmed, I'm confused... the newly added variable DEFAULT_YARN_APPLICATION_CLASSPATH isn't being used anywhere? The point of adding this was to use it, at least, in MRApps.setMRFrameworkClasspath?

Also, not sure whether this was introduced via MAPREDUCE-3505, but we should use Configuration.getStrings rather than do a 'manual' String.split to parse this out.
                
> YARN_APPLICATION_CLASSPATH needs a documented default value in YarnConfiguration
> --------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4422
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4422
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: nodemanager
>    Affects Versions: 2.0.0-alpha
>            Reporter: Arun C Murthy
>            Assignee: Ahmed Radwan
>             Fix For: 2.0.1-alpha
>
>         Attachments: MAPREDUCE-4422.patch, MAPREDUCE-4422_rev2.patch
>
>
> MAPREDUCE-3505 allowed YARN_APPLICATION_CLASSPATH to be configurable.
> However, we didn't add a default value to YarnConfiguration, as-is the norm.
> Ran into it while investigating MAPREDUCE-4421.

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