/**
* 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 junit.framework.TestCase;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.mapred.JobTracker.RecoveryManager;
import org.apache.hadoop.mapred.MiniMRCluster.JobTrackerRunner;
import org.apache.hadoop.mapred.TestJobInProgressListener.MyScheduler;
import org.apache.hadoop.security.UserGroupInformation;
/**
* Test whether the {@link RecoveryManager} is able to tolerate job-recovery
* failures and the jobtracker is able to tolerate {@link RecoveryManager}
* failure.
*/
public class TestRecoveryManager extends TestCase {
private static final Log LOG =
LogFactory.getLog(TestRecoveryManager.class);
private static final Path TEST_DIR =
new Path(System.getProperty("test.build.data", "/tmp"),
"test-recovery-manager");
/**
* Tests the {@link JobTracker} against the exceptions thrown in
* {@link JobTracker.RecoveryManager}. It does the following :
* - submits 2 jobs
* - kills the jobtracker
* - Garble job.xml for one job causing it to fail in constructor
* and job.split for another causing it to fail in init.
* - restarts the jobtracker
* - checks if the jobtraker starts normally
*/
public void testJobTracker() throws Exception {
LOG.info("Testing jobtracker restart with faulty job");
String signalFile = new Path(TEST_DIR, "signal").toString();
JobConf conf = new JobConf();
FileSystem fs = FileSystem.get(new Configuration());
fs.delete(TEST_DIR, true); // cleanup
conf.set("mapred.jobtracker.job.history.block.size", "1024");
conf.set("mapred.jobtracker.job.history.buffer.size", "1024");
MiniMRCluster mr = new MiniMRCluster(1, "file:///", 1, null, null, conf);
JobConf job1 = mr.createJobConf();
UtilsForTests.configureWaitingJobConf(job1,
new Path(TEST_DIR, "input"), new Path(TEST_DIR, "output1"), 2, 0,
"test-recovery-manager", signalFile, signalFile);
// submit the faulty job
RunningJob rJob1 = (new JobClient(job1)).submitJob(job1);
LOG.info("Submitted job " + rJob1.getID());
while (rJob1.mapProgress() < 0.5f) {
LOG.info("Waiting for job " + rJob1.getID() + " to be 50% done");
UtilsForTests.waitFor(100);
}
JobConf job2 = mr.createJobConf();
UtilsForTests.configureWaitingJobConf(job2,
new Path(TEST_DIR, "input"), new Path(TEST_DIR, "output2"), 30, 0,
"test-recovery-manager", signalFile, signalFile);
// submit the faulty job
RunningJob rJob2 = (new JobClient(job2)).submitJob(job2);
LOG.info("Submitted job " + rJob2.getID());
while (rJob2.mapProgress() < 0.5f) {
LOG.info("Waiting for job " + rJob2.getID() + " to be 50% done");
UtilsForTests.waitFor(100);
}
// kill the jobtracker
LOG.info("Stopping jobtracker");
String sysDir = mr.getJobTrackerRunner().getJobTracker().getSystemDir();
mr.stopJobTracker();
// delete the job.xml of job #1 causing the job to fail in constructor
Path jobFile =
new Path(sysDir, rJob1.getID().toString() + Path.SEPARATOR + "job.xml");
LOG.info("Deleting job.xml file : " + jobFile.toString());
fs.delete(jobFile, false); // delete the job.xml file
// create the job.xml file with 0 bytes
FSDataOutputStream out = fs.create(jobFile);
out.write(1);
out.close();
// delete the job.split of job #2 causing the job to fail in initTasks
Path jobSplitFile =
new Path(sysDir, rJob2.getID().toString() + Path.SEPARATOR + "job.split");
LOG.info("Deleting job.split file : " + jobSplitFile.toString());
fs.delete(jobSplitFile, false); // delete the job.split file
// create the job.split file with 0 bytes
out = fs.create(jobSplitFile);
out.write(1);
out.close();
// make sure that the jobtracker is in recovery mode
mr.getJobTrackerConf().setBoolean("mapred.jobtracker.restart.recover",
true);
// start the jobtracker
LOG.info("Starting jobtracker");
mr.startJobTracker();
ClusterStatus status =
mr.getJobTrackerRunner().getJobTracker().getClusterStatus(false);
// check if the jobtracker came up or not
assertEquals("JobTracker crashed!",
JobTracker.State.RUNNING, status.getJobTrackerState());
mr.shutdown();
}
/**
* Tests the {@link JobTracker.RecoveryManager} against the exceptions thrown
* during recovery. It does the following :
* - submits a job with HIGH priority and x tasks
* - allows it to complete 50%
* - submits another job with normal priority and y tasks
* - kills the jobtracker
* - restarts the jobtracker with max-tasks-per-job such that
* y < max-tasks-per-job < x
* - checks if the jobtraker starts normally and job#2 is recovered while
* job#1 is failed.
*/
public void testRecoveryManager() throws Exception {
LOG.info("Testing recovery-manager");
String signalFile = new Path(TEST_DIR, "signal").toString();
// clean up
FileSystem fs = FileSystem.get(new Configuration());
fs.delete(TEST_DIR, true);
JobConf conf = new JobConf();
conf.set("mapred.jobtracker.job.history.block.size", "1024");
conf.set("mapred.jobtracker.job.history.buffer.size", "1024");
MiniMRCluster mr = new MiniMRCluster(1, "file:///", 1, null, null, conf);
JobTracker jobtracker = mr.getJobTrackerRunner().getJobTracker();
JobConf job1 = mr.createJobConf();
// set the high priority
job1.setJobPriority(JobPriority.HIGH);
UtilsForTests.configureWaitingJobConf(job1,
new Path(TEST_DIR, "input"), new Path(TEST_DIR, "output3"), 30, 0,
"test-recovery-manager", signalFile, signalFile);
// submit the faulty job
JobClient jc = new JobClient(job1);
RunningJob rJob1 = jc.submitJob(job1);
LOG.info("Submitted first job " + rJob1.getID());
while (rJob1.mapProgress() < 0.5f) {
LOG.info("Waiting for job " + rJob1.getID() + " to be 50% done");
UtilsForTests.waitFor(100);
}
// now submit job2
JobConf job2 = mr.createJobConf();
String signalFile1 = new Path(TEST_DIR, "signal1").toString();
UtilsForTests.configureWaitingJobConf(job2,
new Path(TEST_DIR, "input"), new Path(TEST_DIR, "output4"), 20, 0,
"test-recovery-manager", signalFile1, signalFile1);
// submit the job
RunningJob rJob2 = (new JobClient(job2)).submitJob(job2);
LOG.info("Submitted job " + rJob2.getID());
// wait for it to init
JobInProgress jip = jobtracker.getJob(rJob2.getID());
while (!jip.inited()) {
LOG.info("Waiting for job " + jip.getJobID() + " to be inited");
UtilsForTests.waitFor(100);
}
// now submit job3 with inappropriate acls
JobConf job3 = mr.createJobConf();
job3.set("hadoop.job.ugi","abc,users");
UtilsForTests.configureWaitingJobConf(job3,
new Path(TEST_DIR, "input"), new Path(TEST_DIR, "output5"), 1, 0,
"test-recovery-manager", signalFile, signalFile);
// submit the job
RunningJob rJob3 = (new JobClient(job3)).submitJob(job3);
LOG.info("Submitted job " + rJob3.getID() + " with different user");
jip = jobtracker.getJob(rJob3.getID());
while (!jip.inited()) {
LOG.info("Waiting for job " + jip.getJobID() + " to be inited");
UtilsForTests.waitFor(100);
}
// kill the jobtracker
LOG.info("Stopping jobtracker");
mr.stopJobTracker();
// make sure that the jobtracker is in recovery mode
mr.getJobTrackerConf().setBoolean("mapred.jobtracker.restart.recover",
true);
mr.getJobTrackerConf().setInt("mapred.jobtracker.maxtasks.per.job", 25);
mr.getJobTrackerConf().setBoolean("mapred.acls.enabled" , true);
UserGroupInformation ugi = UserGroupInformation.readFrom(job1);
mr.getJobTrackerConf().set("mapred.queue.default.acl-submit-job",
ugi.getUserName());
// start the jobtracker
LOG.info("Starting jobtracker");
mr.startJobTracker();
UtilsForTests.waitForJobTracker(jc);
jobtracker = mr.getJobTrackerRunner().getJobTracker();
// assert that job2 is recovered by the jobtracker as job1 would fail
assertEquals("Recovery manager failed to tolerate job failures",
2, jobtracker.getAllJobs().length);
// check if the job#1 has failed
JobStatus status = jobtracker.getJobStatus(rJob1.getID());
assertEquals("Faulty job not failed",
JobStatus.FAILED, status.getRunState());
jip = jobtracker.getJob(rJob2.getID());
assertFalse("Job should be running", jip.isComplete());
status = jobtracker.getJobStatus(rJob3.getID());
assertNull("Job should be missing", status);
mr.shutdown();
}
/**
* Test if restart count of the jobtracker is correctly managed.
* Steps are as follows :
* - start the jobtracker and check if the info file gets created.
* - stops the jobtracker, deletes the jobtracker.info file and checks if
* upon restart the recovery is 'off'
* - submit a job to the jobtracker.
* - restart the jobtracker k times and check if the restart count on ith
* iteration is i.
* - submit a new job and check if its restart count is 0.
* - garble the jobtracker.info file and restart he jobtracker, the
* jobtracker should crash.
*/
public void testRestartCount() throws Exception {
LOG.info("Testing restart-count");
String signalFile = new Path(TEST_DIR, "signal").toString();
// clean up
FileSystem fs = FileSystem.get(new Configuration());
fs.delete(TEST_DIR, true);
JobConf conf = new JobConf();
conf.set("mapred.jobtracker.job.history.block.size", "1024");
conf.set("mapred.jobtracker.job.history.buffer.size", "1024");
conf.setBoolean("mapred.jobtracker.restart.recover", true);
// since there is no need for initing
conf.setClass("mapred.jobtracker.taskScheduler", MyScheduler.class,
TaskScheduler.class);
MiniMRCluster mr = new MiniMRCluster(1, "file:///", 1, null, null, conf);
JobTracker jobtracker = mr.getJobTrackerRunner().getJobTracker();
JobClient jc = new JobClient(mr.createJobConf());
// check if the jobtracker info file exists
Path infoFile = jobtracker.recoveryManager.getRestartCountFile();
assertTrue("Jobtracker infomation is missing", fs.exists(infoFile));
// check if garbling the system files disables the recovery process
LOG.info("Stopping jobtracker for testing with system files deleted");
mr.stopJobTracker();
// delete the info file
Path rFile = jobtracker.recoveryManager.getRestartCountFile();
fs.delete(rFile,false);
// start the jobtracker
LOG.info("Starting jobtracker with system files deleted");
mr.startJobTracker();
UtilsForTests.waitForJobTracker(jc);
jobtracker = mr.getJobTrackerRunner().getJobTracker();
// check if the recovey is disabled
assertFalse("Recovery is not disabled upon missing system files",
jobtracker.recoveryManager.shouldRecover());
// check if the system dir is sane
assertTrue("Recovery file is missing upon restart", fs.exists(rFile));
Path tFile = jobtracker.recoveryManager.getTempRestartCountFile();
assertFalse("Temp recovery file exists upon restart", fs.exists(tFile));
// submit a job
JobConf job = mr.createJobConf();
UtilsForTests.configureWaitingJobConf(job,
new Path(TEST_DIR, "input"), new Path(TEST_DIR, "output6"), 2, 0,
"test-recovery-manager", signalFile, signalFile);
// submit the faulty job
RunningJob rJob = jc.submitJob(job);
LOG.info("Submitted first job " + rJob.getID());
// kill the jobtracker multiple times and check if the count is correct
for (int i = 1; i <= 5; ++i) {
LOG.info("Stopping jobtracker for " + i + " time");
mr.stopJobTracker();
// start the jobtracker
LOG.info("Starting jobtracker for " + i + " time");
mr.startJobTracker();
UtilsForTests.waitForJobTracker(jc);
// check if the system dir is sane
assertTrue("Recovery file is missing upon restart", fs.exists(rFile));
assertFalse("Temp recovery file exists upon restart", fs.exists(tFile));
jobtracker = mr.getJobTrackerRunner().getJobTracker();
JobInProgress jip = jobtracker.getJob(rJob.getID());
// assert if restart count is correct
assertEquals("Recovery manager failed to recover restart count",
i, jip.getNumRestarts());
}
// kill the old job
rJob.killJob();
// II. Submit a new job and check if the restart count is 0
JobConf job1 = mr.createJobConf();
UtilsForTests.configureWaitingJobConf(job1,
new Path(TEST_DIR, "input"), new Path(TEST_DIR, "output7"), 50, 0,
"test-recovery-manager", signalFile, signalFile);
// make sure that the job id's dont clash
jobtracker.getNewJobId();
// submit a new job
rJob = jc.submitJob(job1);
LOG.info("Submitted first job after restart" + rJob.getID());
// assert if restart count is correct
JobInProgress jip = jobtracker.getJob(rJob.getID());
assertEquals("Restart count for new job is incorrect",
0, jip.getNumRestarts());
LOG.info("Stopping jobtracker for testing the fs errors");
mr.stopJobTracker();
// check if system.dir problems in recovery kills the jobtracker
fs.delete(rFile, false);
FSDataOutputStream out = fs.create(rFile);
out.writeBoolean(true);
out.close();
// start the jobtracker
LOG.info("Starting jobtracker with fs errors");
mr.startJobTracker();
JobTrackerRunner runner = mr.getJobTrackerRunner();
assertFalse("JobTracker is still alive", runner.isActive());
mr.shutdown();
}
/**
* Test if the jobtracker waits for the info file to be created before
* starting.
*/
public void testJobTrackerInfoCreation() throws Exception {
LOG.info("Testing jobtracker.info file");
MiniDFSCluster dfs = new MiniDFSCluster(new Configuration(), 1, true, null);
String namenode = (dfs.getFileSystem()).getUri().getHost() + ":"
+ (dfs.getFileSystem()).getUri().getPort();
// shut down the data nodes
dfs.shutdownDataNodes();
// start the jobtracker
JobConf conf = new JobConf();
FileSystem.setDefaultUri(conf, namenode);
conf.set("mapred.job.tracker", "localhost:0");
conf.set("mapred.job.tracker.http.address", "127.0.0.1:0");
JobTracker jobtracker = new JobTracker(conf);
// now check if the update restart count works fine or not
boolean failed = false;
try {
jobtracker.recoveryManager.updateRestartCount();
} catch (IOException ioe) {
failed = true;
}
assertTrue("JobTracker created info files without datanodes!!!", failed);
Path restartFile = jobtracker.recoveryManager.getRestartCountFile();
Path tmpRestartFile = jobtracker.recoveryManager.getTempRestartCountFile();
FileSystem fs = dfs.getFileSystem();
assertFalse("Info file exists after update failure",
fs.exists(restartFile));
assertFalse("Temporary restart-file exists after update failure",
fs.exists(restartFile));
// start 1 data node
dfs.startDataNodes(conf, 1, true, null, null, null, null);
dfs.waitActive();
failed = false;
try {
jobtracker.recoveryManager.updateRestartCount();
} catch (IOException ioe) {
failed = true;
}
assertFalse("JobTracker failed to create info files with datanodes!!!", failed);
}
}