/**
* 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.mapreduce.v2.app.rm;
import org.apache.hadoop.yarn.api.records.Resource;
import org.apache.hadoop.yarn.proto.YarnServiceProtos.SchedulerResourceTypes;
import org.apache.hadoop.yarn.util.Records;
import java.util.EnumSet;
public class ResourceCalculatorUtils {
public static int divideAndCeil(int a, int b) {
if (b == 0) {
return 0;
}
return (a + (b - 1)) / b;
}
public static int computeAvailableContainers(Resource available,
Resource required, EnumSet<SchedulerResourceTypes> resourceTypes) {
if (resourceTypes.contains(SchedulerResourceTypes.CPU)) {
return Math.min(
calculateRatioOrMaxValue(available.getMemory(), required.getMemory()),
calculateRatioOrMaxValue(available.getVirtualCores(), required
.getVirtualCores()));
}
return calculateRatioOrMaxValue(
available.getMemory(), required.getMemory());
}
public static int divideAndCeilContainers(Resource required, Resource factor,
EnumSet<SchedulerResourceTypes> resourceTypes) {
if (resourceTypes.contains(SchedulerResourceTypes.CPU)) {
return Math.max(divideAndCeil(required.getMemory(), factor.getMemory()),
divideAndCeil(required.getVirtualCores(), factor.getVirtualCores()));
}
return divideAndCeil(required.getMemory(), factor.getMemory());
}
private static int calculateRatioOrMaxValue(int numerator, int denominator) {
if (denominator == 0) {
return Integer.MAX_VALUE;
}
return numerator / denominator;
}
}