| /** |
| * 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; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Public; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.hadoop.util.ReflectionUtils; |
| import org.apache.hadoop.yarn.server.resourcemanager.RMContext; |
| import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ApplicationSchedulingConfig; |
| import org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement.AppPlacementAllocator; |
| import org.apache.hadoop.yarn.server.scheduler.SchedulerRequestKey; |
| |
| /** |
| * Factory class to build various application placement policies. |
| */ |
| @Public |
| @Unstable |
| public class ApplicationPlacementAllocatorFactory { |
| |
| /** |
| * Get AppPlacementAllocator related to the placement type requested. |
| * |
| * @param appPlacementAllocatorName |
| * allocator class name. |
| * @return Specific AppPlacementAllocator instance based on type |
| */ |
| public static AppPlacementAllocator<SchedulerNode> getAppPlacementAllocator( |
| String appPlacementAllocatorName, AppSchedulingInfo appSchedulingInfo, |
| SchedulerRequestKey schedulerRequestKey, RMContext rmContext) { |
| Class<?> policyClass; |
| try { |
| if (appPlacementAllocatorName == null) { |
| policyClass = ApplicationSchedulingConfig.DEFAULT_APPLICATION_PLACEMENT_TYPE_CLASS; |
| } else { |
| policyClass = Class.forName(appPlacementAllocatorName); |
| } |
| } catch (ClassNotFoundException e) { |
| policyClass = ApplicationSchedulingConfig.DEFAULT_APPLICATION_PLACEMENT_TYPE_CLASS; |
| } |
| |
| if (!AppPlacementAllocator.class.isAssignableFrom(policyClass)) { |
| policyClass = ApplicationSchedulingConfig.DEFAULT_APPLICATION_PLACEMENT_TYPE_CLASS; |
| } |
| |
| @SuppressWarnings("unchecked") |
| AppPlacementAllocator<SchedulerNode> placementAllocatorInstance = (AppPlacementAllocator<SchedulerNode>) ReflectionUtils |
| .newInstance(policyClass, null); |
| placementAllocatorInstance.initialize(appSchedulingInfo, |
| schedulerRequestKey, rmContext); |
| return placementAllocatorInstance; |
| } |
| } |