Add Minimal Fair Scheduler to MR2
---------------------------------

                 Key: MAPREDUCE-3600
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3600
             Project: Hadoop Map/Reduce
          Issue Type: Sub-task
            Reporter: Patrick Wendell
            Assignee: Patrick Wendell


This covers the addition of the Fair Scheduler to the MR2 infrastructure. This 
patch will represent the minimum functional FairScheduler in MR2. It will be 
limited to a configuration file reader, functionality to calculate fair shares, 
and hooks into the actual MR2 scheduling code. 

It will not include delay scheduling, preemption, or a web UI, which will be 
handled in separate JIRA's. 

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