Rohini Palaniswamy created TEZ-2119:
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             Summary: Counter for launched containers
                 Key: TEZ-2119
                 URL: https://issues.apache.org/jira/browse/TEZ-2119
             Project: Apache Tez
          Issue Type: New Feature
            Reporter: Rohini Palaniswamy


org.apache.tez.common.counters.DAGCounter
                NUM_SUCCEEDED_TASKS=32976
                TOTAL_LAUNCHED_TASKS=32976
                OTHER_LOCAL_TASKS=2
                DATA_LOCAL_TASKS=9147
                RACK_LOCAL_TASKS=23761

It would be very nice to have TOTAL_LAUNCHED_CONTAINERS counter added to this. 
The difference between TOTAL_LAUNCHED_CONTAINERS and TOTAL_LAUNCHED_TASKS 
should make it easy to see how much container reuse is happening. It is very 
hard to find out now.



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