/**
* 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.security.UserGroupInformation;
import org.apache.hadoop.mapreduce.TestSleepJob;
import org.apache.hadoop.util.ToolRunner;
import org.apache.hadoop.conf.Configuration;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.HttpURLConnection;
import java.util.concurrent.Callable;
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.TimeUnit;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
import org.junit.BeforeClass;
import org.junit.AfterClass;
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.
*
* This test suite will often be run inside JCarder in order to catch
* deadlock bugs which have plagued the scheduler in the past - hence
* it is a bit of a "grab-bag" of system tests, since it's important
* that they all run as part of the same JVM instantiation.
*/
public class TestFairSchedulerSystem {
static final int NUM_THREADS=2;
static MiniMRCluster mr;
static JobConf conf;
@BeforeClass
public static void setUp() throws Exception {
conf = new JobConf();
final int taskTrackers = 1;
// Bump up the frequency of preemption updates to test against
// deadlocks, etc.
conf.set("mapred.jobtracker.taskScheduler", FairScheduler.class.getCanonicalName());
conf.set("mapred.fairscheduler.update.interval", "1");
conf.set("mapred.fairscheduler.preemption.interval", "1");
conf.set("mapred.fairscheduler.preemption", "true");
conf.set("mapred.fairscheduler.eventlog.enabled", "true");
conf.set("mapred.fairscheduler.poolnameproperty", "group.name");
conf.set("mapred.job.tracker.persist.jobstatus.active", "false");
mr = new MiniMRCluster(taskTrackers, "file:///", 1, null, null, conf);
}
@AfterClass
public static void tearDown() throws Exception {
if (mr != null) {
mr.shutdown();
}
}
private void runSleepJob(JobConf conf) throws Exception {
String[] args = { "-m", "1", "-r", "1", "-mt", "1", "-rt", "1" };
ToolRunner.run(conf, new TestSleepJob(), args);
}
/**
* Submit some concurrent sleep jobs, and visit the scheduler servlet
* while they're running.
*/
@Test
public void testFairSchedulerSystem() throws Exception {
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 = mr.createJobConf();
runSleepJob(jobConf);
return null;
}
}));
}
JobClient jc = new JobClient(mr.createJobConf(null));
// Wait for the tasks to finish, and visit the scheduler servlet
// every few seconds while waiting.
for (Future<Void> future : futures) {
while (true) {
try {
future.get(3, TimeUnit.SECONDS);
break;
} catch (TimeoutException te) {
// It's OK
}
checkServlet(true);
checkServlet(false);
JobStatus jobs[] = jc.getAllJobs();
if (jobs == null) {
System.err.println("No jobs running, not checking tasklog servlet");
continue;
}
for (JobStatus j : jobs) {
System.err.println("Checking task graph for " + j.getJobID());
try {
checkTaskGraphServlet(j.getJobID());
} catch (AssertionError err) {
// The task graph servlet will be empty if the job has retired.
// This is OK.
RunningJob rj = jc.getJob(j.getJobID());
if (!rj.isComplete()) {
throw err;
}
}
}
}
}
}
/**
* Check the fair scheduler servlet for good status code and smoke test
* for contents.
*/
private void checkServlet(boolean advanced) throws Exception {
String jtURL = "http://localhost:" +
mr.getJobTrackerRunner().getJobTrackerInfoPort();
URL url = new URL(jtURL + "/scheduler" +
(advanced ? "?advanced" : ""));
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("GET");
connection.connect();
assertEquals(200, connection.getResponseCode());
// Just to be sure, slurp the content and make sure it looks like the scheduler
BufferedReader reader = new BufferedReader(
new InputStreamReader(connection.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line).append('\n');
}
String contents = sb.toString();
assertTrue("Bad contents for fair scheduler servlet: " + contents,
contents.contains("Fair Scheduler Administration"));
}
private void checkTaskGraphServlet(JobID job) throws Exception {
String jtURL = "http://localhost:" +
mr.getJobTrackerRunner().getJobTrackerInfoPort();
URL url = new URL(jtURL + "/taskgraph?jobid=" + job.toString() + "&type=map");
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("GET");
connection.connect();
assertEquals(200, connection.getResponseCode());
// Just to be sure, slurp the content and make sure it looks like the scheduler
String contents = slurpContents(connection);
assertTrue("Bad contents for job " + job + ":\n" + contents,
contents.contains("</svg>"));
}
private String slurpContents(HttpURLConnection connection) throws Exception {
BufferedReader reader = new BufferedReader(
new InputStreamReader(connection.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line).append('\n');
}
return sb.toString();
}
}