TestJobTrackerRestartWithLostTracker.java
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网格计算
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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.mapred;
- import org.apache.hadoop.conf.Configuration;
- import org.apache.hadoop.fs.*;
- import org.apache.hadoop.hdfs.MiniDFSCluster;
- import org.apache.hadoop.mapred.TestJobTrackerRestart;
- import junit.framework.TestCase;
- import java.io.*;
- /**
- * This test checks if the jobtracker can detect and recover a tracker that was
- * lost while the jobtracker was down.
- */
- public class TestJobTrackerRestartWithLostTracker extends TestCase {
- final Path testDir = new Path("/jt-restart-lost-tt-testing");
- final Path inDir = new Path(testDir, "input");
- final Path shareDir = new Path(testDir, "share");
- final Path outputDir = new Path(testDir, "output");
- private JobConf configureJob(JobConf conf, int maps, int reduces,
- String mapSignal, String redSignal)
- throws IOException {
- UtilsForTests.configureWaitingJobConf(conf, inDir, outputDir,
- maps, reduces, "test-jobtracker-restart-with-lost-tt",
- mapSignal, redSignal);
- return conf;
- }
- public void testRecoveryWithLostTracker(MiniDFSCluster dfs,
- MiniMRCluster mr)
- throws IOException {
- FileSystem fileSys = dfs.getFileSystem();
- JobConf jobConf = mr.createJobConf();
- int numMaps = 50;
- int numReds = 1;
- String mapSignalFile = UtilsForTests.getMapSignalFile(shareDir);
- String redSignalFile = UtilsForTests.getReduceSignalFile(shareDir);
- // Configure the jobs
- JobConf job = configureJob(jobConf, numMaps, numReds,
- mapSignalFile, redSignalFile);
- fileSys.delete(shareDir, true);
- // Submit a master job
- JobClient jobClient = new JobClient(job);
- RunningJob rJob = jobClient.submitJob(job);
- JobID id = rJob.getID();
- // wait for the job to be inited
- mr.initializeJob(id);
- // Make sure that the master job is 50% completed
- while (UtilsForTests.getJobStatus(jobClient, id).mapProgress()
- < 0.5f) {
- UtilsForTests.waitFor(100);
- }
- // Kill the jobtracker
- mr.stopJobTracker();
- // Signal the maps to complete
- UtilsForTests.signalTasks(dfs, fileSys, true, mapSignalFile, redSignalFile);
- // Enable recovery on restart
- mr.getJobTrackerConf().setBoolean("mapred.jobtracker.restart.recover",
- true);
- // Kill the 2nd tasktracker
- mr.stopTaskTracker(1);
- // Wait for a minute before submitting a job
- UtilsForTests.waitFor(60 * 1000);
- // Restart the jobtracker
- mr.startJobTracker();
- // Check if the jobs are still running
- // Wait for the JT to be ready
- UtilsForTests.waitForJobTracker(jobClient);
- // Signal the reducers to complete
- UtilsForTests.signalTasks(dfs, fileSys, false, mapSignalFile,
- redSignalFile);
- UtilsForTests.waitTillDone(jobClient);
- // Check if the tasks on the lost tracker got re-executed
- assertEquals("Tracker killed while the jobtracker was down did not get lost "
- + "upon restart",
- jobClient.getClusterStatus().getTaskTrackers(), 1);
- // validate the history file
- TestJobHistory.validateJobHistoryFileFormat(id, job, "SUCCESS", true);
- TestJobHistory.validateJobHistoryFileContent(mr, rJob, job);
- }
- public void testRestartWithLostTracker() throws IOException {
- String namenode = null;
- MiniDFSCluster dfs = null;
- MiniMRCluster mr = null;
- FileSystem fileSys = null;
- try {
- Configuration conf = new Configuration();
- conf.setBoolean("dfs.replication.considerLoad", false);
- dfs = new MiniDFSCluster(conf, 1, true, null, null);
- dfs.waitActive();
- fileSys = dfs.getFileSystem();
- // clean up
- fileSys.delete(testDir, true);
- if (!fileSys.mkdirs(inDir)) {
- throw new IOException("Mkdirs failed to create " + inDir.toString());
- }
- // Write the input file
- UtilsForTests.writeFile(dfs.getNameNode(), conf,
- new Path(inDir + "/file"), (short)1);
- dfs.startDataNodes(conf, 1, true, null, null, null, null);
- dfs.waitActive();
- namenode = (dfs.getFileSystem()).getUri().getHost() + ":"
- + (dfs.getFileSystem()).getUri().getPort();
- // Make sure that jobhistory leads to a proper job restart
- // So keep the blocksize and the buffer size small
- JobConf jtConf = new JobConf();
- jtConf.set("mapred.jobtracker.job.history.block.size", "1024");
- jtConf.set("mapred.jobtracker.job.history.buffer.size", "1024");
- jtConf.setInt("mapred.tasktracker.reduce.tasks.maximum", 1);
- jtConf.setLong("mapred.tasktracker.expiry.interval", 25 * 1000);
- jtConf.setInt("mapred.reduce.copy.backoff", 4);
- mr = new MiniMRCluster(2, namenode, 1, null, null, jtConf);
- // Test Lost tracker case
- testRecoveryWithLostTracker(dfs, mr);
- } finally {
- if (mr != null) {
- try {
- mr.shutdown();
- } catch (Exception e) {}
- }
- if (dfs != null) {
- try {
- dfs.shutdown();
- } catch (Exception e) {}
- }
- }
- }
- public static void main(String[] args) throws IOException {
- new TestJobTrackerRestartWithLostTracker().testRestartWithLostTracker();
- }
- }