Option to limit max tasks started per job/queue 
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                 Key: HADOOP-5966
                 URL: https://issues.apache.org/jira/browse/HADOOP-5966
             Project: Hadoop Core
          Issue Type: New Feature
          Components: contrib/capacity-sched
            Reporter: Rajiv Chittajallu


For jobs which call external services, (eg: distcp, crawlers) user/admin should 
be able to control max parallel tasks spawned. There should be a mechanism to 
cap the capacity available for a queue/job. 

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