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HDFS, mail # user - Task status query

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Task status query
John Lilley 2013-09-19, 18:48
How does a YARN application master typically query ongoing status (like percentage completion) of its tasks?
I would like to be able to ultimately relay information to the user like:
100 tasks are scheduled
10 tasks are complete
4 tasks are running and they are (4%, 10%, 50%, 70%) complete
But, given that YARN tasks are simply executables, how can the AM even get at this information?  Can the AM get access to stdout/stderr?