Package org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement

Interface CandidateNodeSet<N extends SchedulerNode>

All Known Implementing Classes:

SimpleCandidateNodeSet

@Private
@Unstable
public interface CandidateNodeSet<N extends SchedulerNode>

A group of nodes which can be allocated by scheduler. It will have following part: 1) A map of nodes which can be schedule-able. 2) Version of the node set, version should be updated if any node added or removed from the node set. This will be used by AppPlacementAllocator or other class to check if it's required to invalidate local caches, etc. 3) Node partition of the candidate set.

Method Summary

Modifier and Type	Method	Description
java.util.Map<org.apache.hadoop.yarn.api.records.NodeId,N>	getAllNodes()	Get all nodes for this CandidateNodeSet
java.lang.String	getPartition()	Node partition of the node set.
long	getVersion()	Version of the CandidateNodeSet, can help AppPlacementAllocator to decide if update is required

Method Detail

getAllNodes

java.util.Map<org.apache.hadoop.yarn.api.records.NodeId,N> getAllNodes()

Get all nodes for this CandidateNodeSet

Returns:

all nodes for this CandidateNodeSet

getVersion

long getVersion()

Version of the CandidateNodeSet, can help AppPlacementAllocator to decide if update is required

Returns:

version

getPartition

java.lang.String getPartition()

Node partition of the node set.

Returns:

node partition