| Interface | Description | 
|---|---|
| QueueOrderingPolicy | This will be used by
  ParentQueueto decide allocation ordering of child queues. | 
| Class | Description | 
|---|---|
| PriorityUtilizationQueueOrderingPolicy | For two queues with the same priority:
 - The queue with less relative used-capacity goes first - today’s behavior. | 
| PriorityUtilizationQueueOrderingPolicy.PriorityQueueResourcesForSorting | A simple storage class to represent a snapshot of a queue. | 
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