Wangda Tan created MAPREDUCE-6574:
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             Summary: MR AM should print host of failed tasks.
                 Key: MAPREDUCE-6574
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6574
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Wangda Tan


Something tasks failed because of issues on NMs. For example, bad disk/network 
could cause reducer fetching failure and mappers need to be re-scheduled.

It will be very helpful to identify such issues if we could print host of 
failed tasks, which we can simply grep MR AM's log to see what happened.



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