@InterfaceAudience.Private
 @InterfaceStability.Unstable
public interface CandidateNodeSet<N extends SchedulerNode>
AppPlacementAllocator or other class to check if it's required to
    invalidate local caches, etc.
 3) Node partition of the candidate set.| Modifier and Type | Method and Description | 
|---|---|
| Map<org.apache.hadoop.yarn.api.records.NodeId,N> | getAllNodes()Get all nodes for this CandidateNodeSet | 
| String | getPartition()Node partition of the node set. | 
| long | getVersion()Version of the CandidateNodeSet, can help  AppPlacementAllocatorto
 decide if update is required | 
Map<org.apache.hadoop.yarn.api.records.NodeId,N> getAllNodes()
long getVersion()
AppPlacementAllocator to
 decide if update is requiredString getPartition()
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