Collect information about number of tasks succeeded / total per time unit for a 
tasktracker. 
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                 Key: HADOOP-5931
                 URL: https://issues.apache.org/jira/browse/HADOOP-5931
             Project: Hadoop Core
          Issue Type: Improvement
          Components: mapred
            Reporter: Hemanth Yamijala


Collecting information of number of tasks succeeded / total per tasktracker and 
being able to see these counts per hour, day and since start time will help 
reason about things like the blacklisting strategy.

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