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  1. Sub-task YARN-9276
    Filter non-existent resource requests actively
  2. Sub-task YARN-6775
    CapacityScheduler: Improvements to assignContainers, avoid unnecessary canAssignToUser/Queue calls
  3. Sub-task YARN-6762
    ChildQueue can override AbstractCSQueue.hasChildQueues to return false always
  4. Sub-task YARN-6682
    Improve performance of AssignmentInformation datastructures
  5. Sub-task YARN-6681
    Eliminate double-copy of child queues in canAssignToThisQueue
  6. Sub-task YARN-6680
    Avoid locking overhead for NO_LABEL lookups
  7. Sub-task YARN-6679
    Reduce Resource instance overhead via non-PBImpl
  8. Sub-task YARN-6361
    FairScheduler: FSLeafQueue.fetchAppsWithDemand CPU usage is high with big queues
  9. Sub-task YARN-6245
    Add FinalResource object to reduce overhead of Resource class instancing
  10. Sub-task YARN-6243
    CapacityScheduler: canAssignToThisQueue should be called only when necessary
  11. Sub-task YARN-4090
    Make Collections.sort() more efficient by caching resource usage
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