| /** |
| * 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.resourcemanager.monitor; |
| |
| import org.apache.hadoop.thirdparty.com.google.common.collect.Sets; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.util.ReflectionUtils; |
| import org.apache.hadoop.yarn.conf.YarnConfiguration; |
| import org.apache.hadoop.yarn.exceptions.YarnException; |
| import org.apache.hadoop.yarn.server.resourcemanager.RMContext; |
| import org.apache.hadoop.yarn.server.resourcemanager.monitor.capacity.ProportionalCapacityPreemptionPolicy; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * Manages scheduling monitors. |
| */ |
| public class SchedulingMonitorManager { |
| private static final Logger LOG = LoggerFactory.getLogger( |
| SchedulingMonitorManager.class); |
| |
| private Map<String, SchedulingMonitor> runningSchedulingMonitors = |
| new HashMap<>(); |
| private RMContext rmContext; |
| |
| private void updateSchedulingMonitors(Configuration conf, |
| boolean startImmediately) throws YarnException { |
| boolean monitorsEnabled = conf.getBoolean( |
| YarnConfiguration.RM_SCHEDULER_ENABLE_MONITORS, |
| YarnConfiguration.DEFAULT_RM_SCHEDULER_ENABLE_MONITORS); |
| |
| if (!monitorsEnabled) { |
| if (!runningSchedulingMonitors.isEmpty()) { |
| // If monitors disabled while we have some running monitors, we should |
| // stop them. |
| LOG.info("Scheduling Monitor disabled, stopping all services"); |
| stopAndRemoveAll(); |
| } |
| |
| return; |
| } |
| |
| // When monitor is enabled, loading policies |
| String[] configuredPolicies = conf.getTrimmedStrings( |
| YarnConfiguration.RM_SCHEDULER_MONITOR_POLICIES); |
| if (configuredPolicies == null || configuredPolicies.length == 0) { |
| return; |
| } |
| |
| Set<String> configurePoliciesSet = new HashSet<>(); |
| for (String s : configuredPolicies) { |
| configurePoliciesSet.add(s); |
| } |
| |
| // Add new monitor when needed |
| for (String s : configurePoliciesSet) { |
| if (!runningSchedulingMonitors.containsKey(s)) { |
| Class<?> policyClass; |
| try { |
| policyClass = Class.forName(s); |
| } catch (ClassNotFoundException e) { |
| String message = "Failed to find class of specified policy=" + s; |
| LOG.warn(message); |
| throw new YarnException(message); |
| } |
| |
| if (SchedulingEditPolicy.class.isAssignableFrom(policyClass)) { |
| SchedulingEditPolicy policyInstance = |
| (SchedulingEditPolicy) ReflectionUtils.newInstance(policyClass, |
| null); |
| SchedulingMonitor mon = new SchedulingMonitor(rmContext, |
| policyInstance); |
| mon.init(conf); |
| if (startImmediately) { |
| mon.start(); |
| } |
| runningSchedulingMonitors.put(s, mon); |
| } else { |
| String message = |
| "Specified policy=" + s + " is not a SchedulingEditPolicy class."; |
| LOG.warn(message); |
| throw new YarnException(message); |
| } |
| } |
| } |
| |
| // Stop monitor when needed. |
| Set<String> disabledPolicies = Sets.difference( |
| runningSchedulingMonitors.keySet(), configurePoliciesSet); |
| for (String disabledPolicy : disabledPolicies) { |
| LOG.info("SchedulingEditPolicy=" + disabledPolicy |
| + " removed, stopping it now ..."); |
| silentlyStopSchedulingMonitor(disabledPolicy); |
| runningSchedulingMonitors.remove(disabledPolicy); |
| } |
| } |
| |
| public synchronized void initialize(RMContext rmContext, |
| Configuration configuration) throws YarnException { |
| this.rmContext = rmContext; |
| stopAndRemoveAll(); |
| |
| updateSchedulingMonitors(configuration, false); |
| } |
| |
| public synchronized void reinitialize(RMContext rmContext, |
| Configuration configuration) throws YarnException { |
| this.rmContext = rmContext; |
| |
| updateSchedulingMonitors(configuration, true); |
| } |
| |
| public synchronized void startAll() { |
| for (SchedulingMonitor schedulingMonitor : runningSchedulingMonitors |
| .values()) { |
| schedulingMonitor.start(); |
| } |
| } |
| |
| private void silentlyStopSchedulingMonitor(String name) { |
| SchedulingMonitor mon = runningSchedulingMonitors.get(name); |
| try { |
| mon.stop(); |
| LOG.info("Sucessfully stopped monitor=" + mon.getName()); |
| } catch (Exception e) { |
| LOG.warn("Exception while stopping monitor=" + mon.getName(), e); |
| } |
| } |
| |
| private void stopAndRemoveAll() { |
| if (!runningSchedulingMonitors.isEmpty()) { |
| for (String schedulingMonitorName : runningSchedulingMonitors |
| .keySet()) { |
| silentlyStopSchedulingMonitor(schedulingMonitorName); |
| } |
| runningSchedulingMonitors.clear(); |
| } |
| } |
| |
| public boolean isRSMEmpty() { |
| return runningSchedulingMonitors.isEmpty(); |
| } |
| |
| public boolean isSameConfiguredPolicies(Set<String> configurePoliciesSet) { |
| return configurePoliciesSet.equals(runningSchedulingMonitors.keySet()); |
| } |
| |
| public SchedulingMonitor getAvailableSchedulingMonitor() { |
| if (isRSMEmpty()) { |
| return null; |
| } |
| for (SchedulingMonitor smon : runningSchedulingMonitors.values()) { |
| if (smon.getSchedulingEditPolicy() |
| instanceof ProportionalCapacityPreemptionPolicy) { |
| return smon; |
| } |
| } |
| return null; |
| } |
| |
| public synchronized void stop() throws YarnException { |
| stopAndRemoveAll(); |
| } |
| } |