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https://issues.apache.org/jira/browse/YARN-129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497216#comment-13497216
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Alejandro Abdelnur commented on YARN-129:
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+1
> Simplify classpath construction for mini YARN tests
> ---------------------------------------------------
>
> Key: YARN-129
> URL: https://issues.apache.org/jira/browse/YARN-129
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: client
> Reporter: Tom White
> Assignee: Tom White
> Attachments: YARN-129.patch, YARN-129.patch, YARN-129.patch
>
>
> The test classpath includes a special file called 'mrapp-generated-classpath'
> (or similar in distributed shell) that is constructed at build time, and
> whose contents are a classpath with all the dependencies needed to run the
> tests. When the classpath for a container (e.g. the AM) is constructed the
> contents of mrapp-generated-classpath is read and added to the classpath, and
> the file itself is then added to the classpath so that later when the AM
> constructs a classpath for a task container it can propagate the test
> classpath correctly.
> This mechanism can be drastically simplified by propagating the system
> classpath of the current JVM (read from the java.class.path property) to a
> launched JVM, but only if running in the context of the mini YARN cluster.
> Any tests that use the mini YARN cluster will automatically work with this
> change. Although any that explicitly deal with mrapp-generated-classpath can
> be simplified.
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