| /** |
| * 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.monitor; |
| |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.ScheduledFuture; |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.service.AbstractService; |
| import org.apache.hadoop.yarn.server.resourcemanager.RMContext; |
| |
| import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting; |
| |
| public class SchedulingMonitor extends AbstractService { |
| |
| private final SchedulingEditPolicy scheduleEditPolicy; |
| private static final Logger LOG = |
| LoggerFactory.getLogger(SchedulingMonitor.class); |
| |
| // ScheduledExecutorService which schedules the PreemptionChecker to run |
| // periodically. |
| private ScheduledExecutorService ses; |
| private ScheduledFuture<?> handler; |
| private volatile boolean stopped; |
| private long monitorInterval; |
| private RMContext rmContext; |
| |
| public SchedulingMonitor(RMContext rmContext, |
| SchedulingEditPolicy scheduleEditPolicy) { |
| super("SchedulingMonitor (" + scheduleEditPolicy.getPolicyName() + ")"); |
| this.scheduleEditPolicy = scheduleEditPolicy; |
| this.rmContext = rmContext; |
| } |
| |
| @VisibleForTesting |
| public synchronized SchedulingEditPolicy getSchedulingEditPolicy() { |
| return scheduleEditPolicy; |
| } |
| |
| public void serviceInit(Configuration conf) throws Exception { |
| LOG.info("Initializing SchedulingMonitor=" + getName()); |
| scheduleEditPolicy.init(conf, rmContext, rmContext.getScheduler()); |
| this.monitorInterval = scheduleEditPolicy.getMonitoringInterval(); |
| super.serviceInit(conf); |
| } |
| |
| @Override |
| public void serviceStart() throws Exception { |
| LOG.info("Starting SchedulingMonitor=" + getName()); |
| assert !stopped : "starting when already stopped"; |
| ses = Executors.newSingleThreadScheduledExecutor(new ThreadFactory() { |
| public Thread newThread(Runnable r) { |
| Thread t = new Thread(r); |
| t.setName(getName()); |
| return t; |
| } |
| }); |
| schedulePreemptionChecker(); |
| super.serviceStart(); |
| } |
| |
| private void schedulePreemptionChecker() { |
| handler = ses.scheduleAtFixedRate(new PolicyInvoker(), |
| 0, monitorInterval, TimeUnit.MILLISECONDS); |
| } |
| |
| @Override |
| public void serviceStop() throws Exception { |
| stopped = true; |
| if (handler != null) { |
| LOG.info("Stop " + getName()); |
| handler.cancel(true); |
| ses.shutdown(); |
| } |
| super.serviceStop(); |
| } |
| |
| @VisibleForTesting |
| public void invokePolicy(){ |
| scheduleEditPolicy.editSchedule(); |
| } |
| |
| private class PolicyInvoker implements Runnable { |
| @Override |
| public void run() { |
| try { |
| if (monitorInterval != scheduleEditPolicy.getMonitoringInterval()) { |
| handler.cancel(true); |
| monitorInterval = scheduleEditPolicy.getMonitoringInterval(); |
| schedulePreemptionChecker(); |
| } else { |
| invokePolicy(); |
| } |
| } catch (Throwable t) { |
| // The preemption monitor does not alter structures nor do structures |
| // persist across invocations. Therefore, log, skip, and retry. |
| LOG.error("Exception raised while executing preemption" |
| + " checker, skip this run..., exception=", t); |
| } |
| } |
| } |
| } |