| /** |
| * 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.api.records.impl; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Public; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.hadoop.yarn.api.records.Resource; |
| import org.apache.hadoop.yarn.api.records.ResourceInformation; |
| |
| import java.util.Arrays; |
| |
| /** |
| * <p> |
| * <code>BaseResource</code> extends Resource to handle base resources such |
| * as memory and CPU. |
| * TODO: We have a long term plan to use AbstractResource when additional |
| * resource types are to be handled as well. |
| * </p> |
| * |
| * <p> |
| * Currently it models both <em>memory</em> and <em>CPU</em>. |
| * </p> |
| * |
| * <p> |
| * The unit for memory is megabytes. CPU is modeled with virtual cores (vcores), |
| * a unit for expressing parallelism. A node's capacity should be configured |
| * with virtual cores equal to its number of physical cores. A container should |
| * be requested with the number of cores it can saturate, i.e. the average |
| * number of threads it expects to have runnable at a time. |
| * </p> |
| * |
| * <p> |
| * Virtual cores take integer values and thus currently CPU-scheduling is very |
| * coarse. A complementary axis for CPU requests that represents processing |
| * power will likely be added in the future to enable finer-grained resource |
| * configuration. |
| * </p> |
| * |
| * @see Resource |
| */ |
| @Public |
| @Unstable |
| public class BaseResource extends Resource { |
| |
| private ResourceInformation memoryResInfo; |
| private ResourceInformation vcoresResInfo; |
| protected ResourceInformation[] resources = null; |
| protected ResourceInformation[] readOnlyResources = null; |
| |
| // Number of mandatory resources, this is added to avoid invoke |
| // MandatoryResources.values().length, since values() internally will |
| // copy array, etc. |
| private static final int NUM_MANDATORY_RESOURCES = 2; |
| |
| protected enum MandatoryResources { |
| MEMORY(0), VCORES(1); |
| |
| private final int id; |
| |
| MandatoryResources(int id) { |
| this.id = id; |
| } |
| |
| public int getId() { |
| return this.id; |
| } |
| } |
| |
| public BaseResource() { |
| // Base constructor. |
| } |
| |
| public BaseResource(long memory, long vcores) { |
| this.memoryResInfo = ResourceInformation.newInstance(MEMORY, |
| ResourceInformation.MEMORY_MB.getUnits(), memory); |
| this.vcoresResInfo = ResourceInformation.newInstance(VCORES, "", vcores); |
| |
| resources = new ResourceInformation[NUM_MANDATORY_RESOURCES]; |
| readOnlyResources = new ResourceInformation[NUM_MANDATORY_RESOURCES]; |
| resources[MandatoryResources.MEMORY.id] = memoryResInfo; |
| resources[MandatoryResources.VCORES.id] = vcoresResInfo; |
| readOnlyResources = Arrays.copyOf(resources, resources.length); |
| } |
| |
| @Override |
| @SuppressWarnings("deprecation") |
| public int getMemory() { |
| return (int) memoryResInfo.getValue(); |
| } |
| |
| @Override |
| @SuppressWarnings("deprecation") |
| public void setMemory(int memory) { |
| this.memoryResInfo.setValue(memory); |
| } |
| |
| @Override |
| public long getMemorySize() { |
| return memoryResInfo.getValue(); |
| } |
| |
| @Override |
| public void setMemorySize(long memory) { |
| this.memoryResInfo.setValue(memory); |
| } |
| |
| @Override |
| public int getVirtualCores() { |
| return (int) vcoresResInfo.getValue(); |
| } |
| |
| @Override |
| public void setVirtualCores(int vcores) { |
| this.vcoresResInfo.setValue(vcores); |
| } |
| |
| @Override |
| public ResourceInformation[] getResources() { |
| return readOnlyResources; |
| } |
| } |