Craig Welch created YARN-3626:

             Summary: On Windows localized resources are not moved to the front 
of the classpath when they should be
                 Key: YARN-3626
             Project: Hadoop YARN
          Issue Type: Bug
          Components: yarn
         Environment: Windows
            Reporter: Craig Welch
            Assignee: Craig Welch

In response to the mapreduce.job.user.classpath.first setting the classpath is 
ordered differently so that localized resources will appear before system 
classpath resources when tasks execute.  On Windows this does not work because 
the localized resources are not linked into their final location when the 
classpath jar is created.  To compensate for that localized jar resources are 
added directly to the classpath generated for the jar rather than being 
discovered from the localized directories.  Unfortunately, they are always 
appended to the classpath, and so are never preferred over system resources.

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