| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement; |
| |
| import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerNode; |
| |
| import java.util.Comparator; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentSkipListSet; |
| |
| /** |
| * <p> |
| * This class has the following functionality: |
| * |
| * <p> |
| * ResourceUsageMultiNodeLookupPolicy holds sorted nodes list based on the |
| * resource usage of nodes at given time. |
| * </p> |
| */ |
| public class ResourceUsageMultiNodeLookupPolicy<N extends SchedulerNode> |
| implements MultiNodeLookupPolicy<N> { |
| |
| protected Map<String, Set<N>> nodesPerPartition = new ConcurrentHashMap<>(); |
| protected Comparator<N> comparator; |
| |
| public ResourceUsageMultiNodeLookupPolicy() { |
| this.comparator = new Comparator<N>() { |
| @Override |
| public int compare(N o1, N o2) { |
| int allocatedDiff = o1.getAllocatedResource() |
| .compareTo(o2.getAllocatedResource()); |
| if (allocatedDiff == 0) { |
| return o1.getNodeID().compareTo(o2.getNodeID()); |
| } |
| return allocatedDiff; |
| } |
| }; |
| } |
| |
| @Override |
| public Iterator<N> getPreferredNodeIterator(Collection<N> nodes, |
| String partition) { |
| return getNodesPerPartition(partition).iterator(); |
| } |
| |
| @Override |
| public void addAndRefreshNodesSet(Collection<N> nodes, |
| String partition) { |
| Set<N> nodeList = new ConcurrentSkipListSet<N>(comparator); |
| nodeList.addAll(nodes); |
| nodesPerPartition.put(partition, Collections.unmodifiableSet(nodeList)); |
| } |
| |
| @Override |
| public Set<N> getNodesPerPartition(String partition) { |
| return nodesPerPartition.getOrDefault(partition, Collections.emptySet()); |
| } |
| } |