Jason Lowe created MAPREDUCE-6697:
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Summary: Concurrent task limits should only be applied when
necessary
Key: MAPREDUCE-6697
URL: https://issues.apache.org/jira/browse/MAPREDUCE-6697
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2
Affects Versions: 2.7.0
Reporter: Jason Lowe
The concurrent task limit feature should only adjust the ANY portion of the AM
heartbeat ask when a limit is truly necessary, otherwise extraneous containers
could be allocated by the RM to the AM adding some overhead to both.
Specifying a concurrent task limit that is beyond the total number of tasks in
the job should be the same as asking for no limit.
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