| /** |
| * 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.monitor.capacity; |
| |
| import org.apache.hadoop.yarn.api.records.ApplicationAttemptId; |
| import org.apache.hadoop.yarn.api.records.Resource; |
| import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer; |
| import org.apache.hadoop.yarn.util.resource.ResourceCalculator; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| public abstract class PreemptionCandidatesSelector { |
| protected CapacitySchedulerPreemptionContext preemptionContext; |
| protected ResourceCalculator rc; |
| |
| PreemptionCandidatesSelector( |
| CapacitySchedulerPreemptionContext preemptionContext) { |
| this.preemptionContext = preemptionContext; |
| this.rc = preemptionContext.getResourceCalculator(); |
| } |
| |
| /** |
| * Get preemption candidates from computed resource sharing and already |
| * selected candidates. |
| * |
| * @param selectedCandidates already selected candidates from previous policies |
| * @param clusterResource total resource |
| * @param totalPreemptedResourceAllowed how many resources allowed to be |
| * preempted in this round. Should be |
| * updated(in-place set) after the call |
| * @return merged selected candidates. |
| */ |
| public abstract Map<ApplicationAttemptId, Set<RMContainer>> selectCandidates( |
| Map<ApplicationAttemptId, Set<RMContainer>> selectedCandidates, |
| Resource clusterResource, Resource totalPreemptedResourceAllowed); |
| |
| /** |
| * Compare by reversed priority order first, and then reversed containerId |
| * order. |
| * |
| * @param containers list of containers to sort for. |
| */ |
| @VisibleForTesting |
| static void sortContainers(List<RMContainer> containers) { |
| Collections.sort(containers, new Comparator<RMContainer>() { |
| @Override |
| public int compare(RMContainer a, RMContainer b) { |
| int schedKeyComp = b.getAllocatedSchedulerKey() |
| .compareTo(a.getAllocatedSchedulerKey()); |
| if (schedKeyComp != 0) { |
| return schedKeyComp; |
| } |
| return b.getContainerId().compareTo(a.getContainerId()); |
| } |
| }); |
| } |
| |
| } |