Sandy Ryza created MAPREDUCE-5527:
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             Summary: Add CONTAINERS_MILLIS_MAPS|REDUCES counters
                 Key: MAPREDUCE-5527
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5527
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
            Reporter: Sandy Ryza


It would be helpful to have a counters which report the total wallclock time 
spent in all map/reduce tasks.  This is what SLOTS_MILLIS_MAPS usually did in 
MR1. 

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