| /** |
| * 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.resource; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.hadoop.yarn.api.records.Resource; |
| |
| /** |
| * A set of {@link Resource} comparison and manipulation interfaces. |
| */ |
| @Private |
| @Unstable |
| public abstract class ResourceCalculator { |
| |
| private static final Log LOG = LogFactory.getLog(ResourceCalculator.class); |
| |
| public abstract int |
| compare(Resource clusterResource, Resource lhs, Resource rhs); |
| |
| public static int divideAndCeil(int a, int b) { |
| if (b == 0) { |
| LOG.info("divideAndCeil called with a=" + a + " b=" + b); |
| return 0; |
| } |
| return (a + (b - 1)) / b; |
| } |
| |
| public static int roundUp(int a, int b) { |
| return divideAndCeil(a, b) * b; |
| } |
| |
| public static int roundDown(int a, int b) { |
| return (a / b) * b; |
| } |
| |
| /** |
| * Compute the number of containers which can be allocated given |
| * <code>available</code> and <code>required</code> resources. |
| * |
| * @param available available resources |
| * @param required required resources |
| * @return number of containers which can be allocated |
| */ |
| public abstract int computeAvailableContainers( |
| Resource available, Resource required); |
| |
| /** |
| * Multiply resource <code>r</code> by factor <code>by</code> |
| * and normalize up using step-factor <code>stepFactor</code>. |
| * |
| * @param r resource to be multiplied |
| * @param by multiplier |
| * @param stepFactor factor by which to normalize up |
| * @return resulting normalized resource |
| */ |
| public abstract Resource multiplyAndNormalizeUp( |
| Resource r, double by, Resource stepFactor); |
| |
| /** |
| * Multiply resource <code>r</code> by factor <code>by</code> |
| * and normalize down using step-factor <code>stepFactor</code>. |
| * |
| * @param r resource to be multiplied |
| * @param by multiplier |
| * @param stepFactor factor by which to normalize down |
| * @return resulting normalized resource |
| */ |
| public abstract Resource multiplyAndNormalizeDown( |
| Resource r, double by, Resource stepFactor); |
| |
| /** |
| * Normalize resource <code>r</code> given the base |
| * <code>minimumResource</code>. |
| * |
| * @param r resource |
| * @param minimumResource step-factor |
| * @return normalized resource |
| */ |
| public abstract Resource normalize(Resource r, Resource minimumResource); |
| |
| /** |
| * Round-up resource <code>r</code> given factor <code>stepFactor</code>. |
| * |
| * @param r resource |
| * @param stepFactor step-factor |
| * @return rounded resource |
| */ |
| public abstract Resource roundUp(Resource r, Resource stepFactor); |
| |
| /** |
| * Round-down resource <code>r</code> given factor <code>stepFactor</code>. |
| * |
| * @param r resource |
| * @param stepFactor step-factor |
| * @return rounded resource |
| */ |
| public abstract Resource roundDown(Resource r, Resource stepFactor); |
| |
| /** |
| * Divide resource <code>numerator</code> by resource <code>denominator</code> |
| * using specified policy (domination, average, fairness etc.); hence overall |
| * <code>clusterResource</code> is provided for context. |
| * |
| * @param clusterResource cluster resources |
| * @param numerator numerator |
| * @param denominator denominator |
| * @return <code>numerator</code>/<code>denominator</code> |
| * using specific policy |
| */ |
| public abstract float divide( |
| Resource clusterResource, Resource numerator, Resource denominator); |
| |
| /** |
| * Ratio of resource <code>a</code> to resource <code>b</code>. |
| * |
| * @param a resource |
| * @param b resource |
| * @return ratio of resource <code>a</code> to resource <code>b</code> |
| */ |
| public abstract float ratio(Resource a, Resource b); |
| |
| /** |
| * Divide-and-ceil <code>numerator</code> by <code>denominator</code>. |
| * |
| * @param numerator numerator resource |
| * @param denominator denominator |
| * @return resultant resource |
| */ |
| public abstract Resource divideAndCeil(Resource numerator, int denominator); |
| |
| } |