/**
* 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.mapred;
import java.io.IOException;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import org.apache.hadoop.mapreduce.JobID;
import org.apache.hadoop.mapred.JobStatus;
import org.apache.hadoop.tools.rumen.JobStory;
import org.apache.hadoop.tools.rumen.JobStoryProducer;
/**
* Class that simulates a job client. It's main functionality is to submit jobs
* to the simulation engine, and shutdown the simulation engine if the job
* producer runs out of jobs.
* TODO: Change System.out.printXX to LOG.xxx.
*/
public class SimulatorJobClient implements SimulatorEventListener {
private final JobTracker jobTracker;
private final JobStoryProducer jobStoryProducer;
private Set<JobID> runningJobs = new LinkedHashSet<JobID>();
private boolean noMoreJobs = false;
/**
* Constructor.
*
* @param jobTracker
* The job tracker where we submit job to. Note that the {@link
* SimulatorJobClient} interacts with the JobTracker through the
* {@link ClientProtocol}.
* @param jobStoryProducer
*/
public SimulatorJobClient(JobTracker jobTracker, JobStoryProducer jobStoryProducer) {
this.jobTracker = jobTracker;
this.jobStoryProducer = jobStoryProducer;
}
@Override
public List<SimulatorEvent> init(long when) throws IOException {
JobStory job = jobStoryProducer.getNextJob();
if (job.getSubmissionTime() != when) {
throw new IOException("Inconsistent submission time for the first job: "
+ when + " != " + job.getSubmissionTime()+".");
}
JobSubmissionEvent event = new JobSubmissionEvent(this, when, job);
return Collections.<SimulatorEvent> singletonList(event);
}
@Override
public List<SimulatorEvent> accept(SimulatorEvent event)
throws IOException {
if (event instanceof JobSubmissionEvent) {
JobSubmissionEvent submitEvent = (JobSubmissionEvent)(event);
// Submit job
JobStatus status = null;
try {
status = submitJob(submitEvent.getJob());
} catch (InterruptedException e) {
throw new IOException(e);
}
runningJobs.add(status.getJobID());
System.out.println("Job " + status.getJobID() +
" is submitted at " + submitEvent.getTimeStamp());
JobStory nextJob = jobStoryProducer.getNextJob();
if (nextJob == null) {
noMoreJobs = true;
return SimulatorEngine.EMPTY_EVENTS;
}
return Collections.<SimulatorEvent>singletonList(
new JobSubmissionEvent(this, nextJob.getSubmissionTime(), nextJob));
} else if (event instanceof JobCompleteEvent) {
JobCompleteEvent jobCompleteEvent = (JobCompleteEvent)event;
JobStatus jobStatus = jobCompleteEvent.getJobStatus();
System.out.println("Job " + jobStatus.getJobID() +
" completed at " + jobCompleteEvent.getTimeStamp() +
" runtime: " +
(jobCompleteEvent.getTimeStamp() - jobStatus.getStartTime()));
runningJobs.remove(jobCompleteEvent.getJobStatus().getJobID());
if (noMoreJobs && runningJobs.isEmpty()) {
jobCompleteEvent.getEngine().shutdown();
}
return SimulatorEngine.EMPTY_EVENTS;
} else {
throw new IllegalArgumentException("unknown event type: " + event.getClass());
}
}
@SuppressWarnings("deprecation")
private JobStatus submitJob(JobStory job)
throws IOException, InterruptedException {
// honor the JobID from JobStory first.
JobID jobId = job.getJobID();
if (jobId == null) {
// If not available, obtain JobID from JobTracker.
jobId = jobTracker.getNewJobId();
}
SimulatorJobCache.put(org.apache.hadoop.mapred.JobID.downgrade(jobId), job);
return jobTracker.submitJob(org.apache.hadoop.mapred.JobID.downgrade(jobId));
}
}