| /** |
| * 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 |
| * <p/> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p/> |
| * 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.nodemanager.containermanager.linux.resources; |
| |
| import org.apache.commons.io.FileUtils; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.classification.VisibleForTesting; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.nio.charset.StandardCharsets; |
| |
| /** |
| * An implementation for using CGroups to restrict CPU usage on Linux. The |
| * implementation supports 3 different controls - restrict usage of all YARN |
| * containers, restrict relative usage of individual YARN containers and |
| * restrict usage of individual YARN containers. Admins can set the overall CPU |
| * to be used by all YARN containers - this is implemented by setting |
| * cpu.cfs_period_us and cpu.cfs_quota_us to the ratio desired. If strict |
| * resource usage mode is not enabled, cpu.shares is set for individual |
| * containers - this prevents containers from exceeding the overall limit for |
| * YARN containers but individual containers can use as much of the CPU as |
| * available(under the YARN limit). If strict resource usage is enabled, then |
| * container can only use the percentage of CPU allocated to them and this is |
| * again implemented using cpu.cfs_period_us and cpu.cfs_quota_us. |
| * |
| */ |
| @InterfaceStability.Unstable |
| @InterfaceAudience.Private |
| public class CGroupsCpuResourceHandlerImpl extends AbstractCGroupsCpuResourceHandler { |
| private static final CGroupsHandler.CGroupController CPU = |
| CGroupsHandler.CGroupController.CPU; |
| |
| @VisibleForTesting |
| static final int CPU_DEFAULT_WEIGHT = 1024; // set by kernel |
| static final int CPU_DEFAULT_WEIGHT_OPPORTUNISTIC = 2; |
| |
| |
| CGroupsCpuResourceHandlerImpl(CGroupsHandler cGroupsHandler) { |
| super(cGroupsHandler); |
| } |
| |
| @Override |
| protected void updateCgroupMaxCpuLimit(String cgroupId, String quota, String period) throws ResourceHandlerException { |
| if (quota != null) { |
| cGroupsHandler |
| .updateCGroupParam(CPU, cgroupId, CGroupsHandler.CGROUP_CPU_QUOTA_US, quota); |
| } |
| if (period != null) { |
| cGroupsHandler |
| .updateCGroupParam(CPU, cgroupId, CGroupsHandler.CGROUP_CPU_PERIOD_US, period); |
| } |
| } |
| |
| @Override |
| protected int getOpportunisticCpuWeight() { |
| return CPU_DEFAULT_WEIGHT_OPPORTUNISTIC; |
| } |
| protected int getCpuWeightByContainerVcores(int containerVCores) { |
| return containerVCores * CPU_DEFAULT_WEIGHT; |
| } |
| |
| @Override |
| protected void updateCgroupCpuWeight(String cgroupId, int weight) throws ResourceHandlerException { |
| cGroupsHandler.updateCGroupParam(CPU, cgroupId, CGroupsHandler.CGROUP_CPU_SHARES, |
| String.valueOf(weight)); |
| } |
| |
| @Override |
| public boolean cpuLimitExists(String cgroupPath) throws ResourceHandlerException { |
| try { |
| return checkCgroupV1CPULimitExists(cgroupPath); |
| } catch (IOException e) { |
| throw new ResourceHandlerException("Failed to check CPU limit", e); |
| } |
| } |
| |
| @InterfaceAudience.Private |
| public static boolean checkCgroupV1CPULimitExists(String path) throws IOException { |
| File quotaFile = new File(path, |
| CPU.getName() + "." + CGroupsHandler.CGROUP_CPU_QUOTA_US); |
| if (quotaFile.exists()) { |
| String contents = FileUtils.readFileToString(quotaFile, StandardCharsets.UTF_8); |
| return Integer.parseInt(contents.trim()) != -1; |
| } |
| return false; |
| } |
| } |