zhangshilong created YARN-6045:
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             Summary: apps/queues that have no pending containers will still 
affect the efficiency of scheduling
                 Key: YARN-6045
                 URL: https://issues.apache.org/jira/browse/YARN-6045
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: fairscheduler
    Affects Versions: 2.7.1
         Environment: jdk 1.7
kernel:2.6.32-431.20.3.el6
            Reporter: zhangshilong
            Assignee: zhangshilong


Sorting queues/apps consumes a significant amount of time during a single 
container allocation.
Each time a container is assigned, all queues / apps are sorted by hierarchy.
In practice, many queues / apps without pending container  do not need to 
participate in the sort.
Without the need for resources, apps / queues do not participate in sorting, 
scheduling performance will increase a lot.




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