| /** |
| * 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; |
| |
| import org.apache.commons.lang.NotImplementedException; |
| import org.apache.hadoop.classification.InterfaceAudience.Public; |
| import org.apache.hadoop.classification.InterfaceStability.Evolving; |
| import org.apache.hadoop.classification.InterfaceStability.Stable; |
| import org.apache.hadoop.yarn.api.ApplicationMasterProtocol; |
| |
| |
| /** |
| * <p><code>Resource</code> models a set of computer resources in the |
| * cluster.</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> |
| * |
| * <p>Typically, applications request <code>Resource</code> of suitable |
| * capability to run their component tasks.</p> |
| * |
| * @see ResourceRequest |
| * @see ApplicationMasterProtocol#allocate(org.apache.hadoop.yarn.api.protocolrecords.AllocateRequest) |
| */ |
| @Public |
| @Stable |
| public abstract class Resource implements Comparable<Resource> { |
| |
| private static class SimpleResource extends Resource { |
| private long memory; |
| private long vcores; |
| SimpleResource(long memory, long vcores) { |
| this.memory = memory; |
| this.vcores = vcores; |
| } |
| @Override |
| public int getMemory() { |
| return castToIntSafely(memory); |
| } |
| @Override |
| public void setMemory(int memory) { |
| this.memory = memory; |
| } |
| @Override |
| public long getMemorySize() { |
| return memory; |
| } |
| @Override |
| public void setMemorySize(long memory) { |
| this.memory = memory; |
| } |
| @Override |
| public int getVirtualCores() { |
| return castToIntSafely(vcores); |
| } |
| @Override |
| public void setVirtualCores(int vcores) { |
| this.vcores = vcores; |
| } |
| } |
| |
| @Public |
| @Stable |
| public static Resource newInstance(int memory, int vCores) { |
| return new SimpleResource(memory, vCores); |
| } |
| |
| @Public |
| @Stable |
| public static Resource newInstance(long memory, int vCores) { |
| return new SimpleResource(memory, vCores); |
| } |
| |
| /** |
| * This method is DEPRECATED: |
| * Use {@link Resource#getMemorySize()} instead |
| * |
| * Get <em>memory</em> of the resource. |
| * @return <em>memory</em> of the resource |
| */ |
| @Public |
| @Deprecated |
| public abstract int getMemory(); |
| |
| /** |
| * Get <em>memory</em> of the resource. |
| * @return <em>memory</em> of the resource |
| */ |
| @Public |
| @Stable |
| public long getMemorySize() { |
| throw new NotImplementedException( |
| "This method is implemented by ResourcePBImpl"); |
| } |
| |
| /** |
| * Set <em>memory</em> of the resource. |
| * @param memory <em>memory</em> of the resource |
| */ |
| @Public |
| @Deprecated |
| public abstract void setMemory(int memory); |
| |
| /** |
| * Set <em>memory</em> of the resource. |
| * @param memory <em>memory</em> of the resource |
| */ |
| @Public |
| @Stable |
| public void setMemorySize(long memory) { |
| throw new NotImplementedException( |
| "This method is implemented by ResourcePBImpl"); |
| } |
| |
| |
| /** |
| * Get <em>number of virtual cpu cores</em> of the resource. |
| * |
| * Virtual cores are a unit for expressing CPU 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. |
| * |
| * @return <em>num of virtual cpu cores</em> of the resource |
| */ |
| @Public |
| @Evolving |
| public abstract int getVirtualCores(); |
| |
| /** |
| * Set <em>number of virtual cpu cores</em> of the resource. |
| * |
| * Virtual cores are a unit for expressing CPU 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. |
| * |
| * @param vCores <em>number of virtual cpu cores</em> of the resource |
| */ |
| @Public |
| @Evolving |
| public abstract void setVirtualCores(int vCores); |
| |
| @Override |
| public int hashCode() { |
| final int prime = 263167; |
| |
| int result = (int) (939769357 |
| + getMemorySize()); // prime * result = 939769357 initially |
| result = prime * result + getVirtualCores(); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (!(obj instanceof Resource)) |
| return false; |
| Resource other = (Resource) obj; |
| if (getMemorySize() != other.getMemorySize() || |
| getVirtualCores() != other.getVirtualCores()) { |
| return false; |
| } |
| return true; |
| } |
| |
| @Override |
| public int compareTo(Resource other) { |
| long diff = this.getMemorySize() - other.getMemorySize(); |
| if (diff == 0) { |
| diff = this.getVirtualCores() - other.getVirtualCores(); |
| } |
| return diff == 0 ? 0 : (diff > 0 ? 1 : -1); |
| } |
| |
| @Override |
| public String toString() { |
| return "<memory:" + getMemorySize() + ", vCores:" + getVirtualCores() + ">"; |
| } |
| |
| /** |
| * Convert long to int for a resource value safely. This method assumes |
| * resource value is positive. |
| * |
| * @param value long resource value |
| * @return int resource value |
| */ |
| protected static int castToIntSafely(long value) { |
| if (value > Integer.MAX_VALUE) { |
| return Integer.MAX_VALUE; |
| } |
| return Long.valueOf(value).intValue(); |
| } |
| } |