/**
* 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 org.apache.hadoop.examples.SleepJob;
import org.apache.hadoop.util.ToolRunner;
import org.apache.hadoop.conf.Configuration;
import java.util.concurrent.Callable;
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
import static org.junit.Assert.*;
/**
* System tests for the fair scheduler. These run slower than the
* mock-based tests in TestFairScheduler but have a better chance
* of catching synchronization bugs with the real JT.
*/
public class TestFairSchedulerSystem {
static final int NUM_THREADS=5;
private void runSleepJob(JobConf conf) throws Exception {
String[] args = { "-m", "1", "-r", "1", "-mt", "1", "-rt", "1" };
ToolRunner.run(conf, new SleepJob(), args);
}
/**
* Bump up the frequency of preemption updates to test against
* deadlocks, etc.
*/
@Test
public void testPreemptionUpdates() throws Exception {
MiniMRCluster mr = null;
try {
final int taskTrackers = 1;
Configuration conf = new Configuration();
conf.set("mapred.jobtracker.taskScheduler", FairScheduler.class.getCanonicalName());
conf.set("mapred.fairscheduler.update.interval", "0");
conf.set("mapred.fairscheduler.preemption.interval", "0");
conf.set("mapred.fairscheduler.preemption", "true");
conf.set("mapred.fairscheduler.eventlog.enabled", "true");
mr = new MiniMRCluster(taskTrackers, "file:///", 1, null, null, new JobConf(conf));
final MiniMRCluster finalMR = mr;
ExecutorService exec = Executors.newFixedThreadPool(NUM_THREADS);
List<Future<Void>> futures = new ArrayList<Future<Void>>(NUM_THREADS);
for (int i = 0; i < NUM_THREADS; i++) {
futures.add(exec.submit(new Callable<Void>() {
public Void call() throws Exception {
JobConf jobConf = finalMR.createJobConf();
runSleepJob(jobConf);
return null;
}
}));
}
for (Future<Void> future : futures) {
future.get();
}
} finally {
if (mr != null) { mr.shutdown();
}
}
}
}