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/**
* 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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.service.AbstractService;
import org.apache.hadoop.yarn.server.resourcemanager.RMContext;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.PreemptableResourceScheduler;
import com.google.common.annotations.VisibleForTesting;
public class SchedulingMonitor extends AbstractService {
private final SchedulingEditPolicy scheduleEditPolicy;
private static final Log LOG = LogFactory.getLog(SchedulingMonitor.class);
//thread which runs periodically to see the last time since a heartbeat is
//received.
private Thread checkerThread;
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;
}
public long getMonitorInterval() {
return monitorInterval;
}
@VisibleForTesting
public synchronized SchedulingEditPolicy getSchedulingEditPolicy() {
return scheduleEditPolicy;
}
@SuppressWarnings("unchecked")
public void serviceInit(Configuration conf) throws Exception {
scheduleEditPolicy.init(conf, rmContext.getDispatcher().getEventHandler(),
(PreemptableResourceScheduler) rmContext.getScheduler());
this.monitorInterval = scheduleEditPolicy.getMonitoringInterval();
super.serviceInit(conf);
}
@Override
public void serviceStart() throws Exception {
assert !stopped : "starting when already stopped";
checkerThread = new Thread(new PreemptionChecker());
checkerThread.setName(getName());
checkerThread.start();
super.serviceStart();
}
@Override
public void serviceStop() throws Exception {
stopped = true;
if (checkerThread != null) {
checkerThread.interrupt();
}
super.serviceStop();
}
@VisibleForTesting
public void invokePolicy(){
scheduleEditPolicy.editSchedule();
}
private class PreemptionChecker implements Runnable {
@Override
public void run() {
while (!stopped && !Thread.currentThread().isInterrupted()) {
//invoke the preemption policy at a regular pace
//the policy will generate preemption or kill events
//managed by the dispatcher
invokePolicy();
try {
Thread.sleep(monitorInterval);
} catch (InterruptedException e) {
LOG.info(getName() + " thread interrupted");
break;
}
}
}
}
}
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