Tao Yang created YARN-7005:
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             Summary: Skip unnecessary sorting and iterating process for child 
queues without pending resource to optimize schedule performance
                 Key: YARN-7005
                 URL: https://issues.apache.org/jira/browse/YARN-7005
             Project: Hadoop YARN
          Issue Type: Improvement
    Affects Versions: 3.0.0-alpha4, 2.9.0
            Reporter: Tao Yang


Nowadays even if there is only one pending app in a queue, the scheduling 
process will go through all queues anyway and costs most of time on sorting and 
iterating child queues in ParentQueue#assignContainersToChildQueues. 
IIUIC, queues that have no pending resource can be skipped for sorting and 
iterating process to reduce time cost, obviously for a cluster with many 
queues. Please feel free to correct me if I ignore something else. Thanks.



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