[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | package org.apache.hadoop.mapred; |
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| 19 | |
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| 20 | import org.apache.commons.logging.Log; |
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| 21 | import org.apache.commons.logging.LogFactory; |
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| 22 | import org.apache.hadoop.conf.Configuration; |
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| 23 | import org.apache.hadoop.fs.*; |
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| 24 | import org.apache.hadoop.hdfs.MiniDFSCluster; |
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| 25 | |
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| 26 | import junit.framework.TestCase; |
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| 27 | import java.io.*; |
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| 28 | import java.util.HashSet; |
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| 29 | import java.util.Set; |
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| 30 | |
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| 31 | /** |
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| 32 | * This test checks jobtracker in safe mode. In safe mode the jobtracker upon |
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| 33 | * restart doesnt schedule any new tasks and waits for the (old) trackers to |
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| 34 | * join back. |
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| 35 | */ |
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| 36 | public class TestJobTrackerSafeMode extends TestCase { |
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| 37 | final Path testDir = |
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| 38 | new Path(System.getProperty("test.build.data", "/tmp"), "jt-safemode"); |
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| 39 | final Path inDir = new Path(testDir, "input"); |
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| 40 | final Path shareDir = new Path(testDir, "share"); |
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| 41 | final Path outputDir = new Path(testDir, "output"); |
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| 42 | final int numDir = 1; |
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| 43 | final int numTrackers = 2; |
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| 44 | |
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| 45 | private static final Log LOG = |
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| 46 | LogFactory.getLog(TestJobTrackerSafeMode.class); |
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| 47 | |
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| 48 | private JobConf configureJob(JobConf conf, int maps, int reduces, |
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| 49 | String mapSignal, String redSignal) |
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| 50 | throws IOException { |
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| 51 | UtilsForTests.configureWaitingJobConf(conf, inDir, outputDir, |
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| 52 | maps, reduces, "test-jobtracker-safemode", |
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| 53 | mapSignal, redSignal); |
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| 54 | return conf; |
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| 55 | } |
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| 56 | |
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| 57 | /** |
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| 58 | * Tests the jobtracker's safemode. The test is as follows : |
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| 59 | * - starts a cluster with 2 trackers |
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| 60 | * - submits a job with large (40) maps to make sure that all the trackers |
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| 61 | * are logged to the job history |
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| 62 | * - wait for the job to be 50% done |
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| 63 | * - stop the jobtracker |
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| 64 | * - wait for the trackers to be done with all the tasks |
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| 65 | * - kill a task tracker |
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| 66 | * - start the jobtracker |
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| 67 | * - start 2 more trackers |
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| 68 | * - now check that while all the tracker are detected (or lost) the |
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| 69 | * scheduling window is closed |
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| 70 | * - check that after all the trackers are recovered, scheduling is opened |
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| 71 | */ |
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| 72 | private void testSafeMode(MiniDFSCluster dfs, MiniMRCluster mr) |
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| 73 | throws IOException { |
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| 74 | FileSystem fileSys = dfs.getFileSystem(); |
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| 75 | JobConf jobConf = mr.createJobConf(); |
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| 76 | String mapSignalFile = UtilsForTests.getMapSignalFile(shareDir); |
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| 77 | String redSignalFile = UtilsForTests.getReduceSignalFile(shareDir); |
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| 78 | JobTracker jobtracker = mr.getJobTrackerRunner().getJobTracker(); |
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| 79 | int numTracker = jobtracker.getClusterStatus(false).getTaskTrackers(); |
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| 80 | |
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| 81 | // Configure the jobs |
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| 82 | JobConf job = configureJob(jobConf, 40, 0, mapSignalFile, redSignalFile); |
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| 83 | |
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| 84 | fileSys.delete(shareDir, true); |
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| 85 | |
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| 86 | // Submit a master job |
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| 87 | JobClient jobClient = new JobClient(job); |
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| 88 | RunningJob rJob = jobClient.submitJob(job); |
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| 89 | JobID id = rJob.getID(); |
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| 90 | |
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| 91 | // wait for the job to be inited |
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| 92 | mr.initializeJob(id); |
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| 93 | |
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| 94 | // Make sure that the master job is 50% completed |
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| 95 | while (UtilsForTests.getJobStatus(jobClient, id).mapProgress() |
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| 96 | < 0.5f) { |
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| 97 | LOG.info("Waiting for the job to be 50% done"); |
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| 98 | UtilsForTests.waitFor(100); |
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| 99 | } |
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| 100 | |
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| 101 | // Kill the jobtracker |
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| 102 | mr.stopJobTracker(); |
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| 103 | |
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| 104 | // Enable recovery on restart |
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| 105 | mr.getJobTrackerConf().setBoolean("mapred.jobtracker.restart.recover", |
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| 106 | true); |
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| 107 | |
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| 108 | // Signal the maps to complete |
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| 109 | UtilsForTests.signalTasks(dfs, fileSys, true, mapSignalFile, redSignalFile); |
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| 110 | |
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| 111 | // Signal the reducers to complete |
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| 112 | UtilsForTests.signalTasks(dfs, fileSys, false, mapSignalFile, |
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| 113 | redSignalFile); |
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| 114 | |
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| 115 | // wait for the tasks to complete at the tracker |
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| 116 | Set<String> trackers = new HashSet<String>(); |
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| 117 | for (int i = 0 ; i < numTracker; ++i) { |
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| 118 | TaskTracker t = mr.getTaskTrackerRunner(i).getTaskTracker(); |
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| 119 | trackers.add(t.getName()); |
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| 120 | int runningCount = t.getRunningTaskStatuses().size(); |
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| 121 | while (runningCount != 0) { |
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| 122 | LOG.info("Waiting for tracker " + t.getName() + " to stabilize"); |
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| 123 | UtilsForTests.waitFor(100); |
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| 124 | runningCount = 0; |
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| 125 | for (TaskStatus status : t.getRunningTaskStatuses()) { |
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| 126 | if (status.getIsMap() |
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| 127 | && (status.getRunState() == TaskStatus.State.UNASSIGNED |
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| 128 | || status.getRunState() == TaskStatus.State.RUNNING)) { |
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| 129 | ++runningCount; |
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| 130 | } |
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| 131 | } |
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| 132 | } |
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| 133 | } |
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| 134 | |
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| 135 | LOG.info("Trackers have stabilized"); |
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| 136 | |
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| 137 | // Kill a tasktracker |
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| 138 | int trackerToKill = --numTracker; |
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| 139 | TaskTracker t = mr.getTaskTrackerRunner(trackerToKill).getTaskTracker(); |
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| 140 | |
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| 141 | trackers.remove(t.getName()); // remove this from the set to check |
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| 142 | |
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| 143 | Set<String> lostTrackers = new HashSet<String>(); |
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| 144 | lostTrackers.add(t.getName()); |
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| 145 | |
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| 146 | // get the attempt-id's to ignore |
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| 147 | // stop the tracker |
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| 148 | LOG.info("Stopping tracker : " + t.getName()); |
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| 149 | mr.getTaskTrackerRunner(trackerToKill).getTaskTracker().shutdown(); |
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| 150 | mr.stopTaskTracker(trackerToKill); |
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| 151 | |
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| 152 | // Restart the jobtracker |
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| 153 | mr.startJobTracker(); |
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| 154 | |
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| 155 | // Wait for the JT to be ready |
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| 156 | UtilsForTests.waitForJobTracker(jobClient); |
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| 157 | |
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| 158 | jobtracker = mr.getJobTrackerRunner().getJobTracker(); |
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| 159 | |
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| 160 | // Start a tracker |
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| 161 | LOG.info("Start a new tracker"); |
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| 162 | mr.startTaskTracker(null, null, ++numTracker, numDir); |
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| 163 | |
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| 164 | // Start a tracker |
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| 165 | LOG.info("Start a new tracker"); |
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| 166 | mr.startTaskTracker(null, null, ++numTracker, numDir); |
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| 167 | |
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| 168 | // Check if the jobs are still running |
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| 169 | |
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| 170 | // Wait for the tracker to be lost |
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| 171 | boolean shouldSchedule = jobtracker.recoveryManager.shouldSchedule(); |
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| 172 | while (!checkTrackers(jobtracker, trackers, lostTrackers)) { |
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| 173 | assertFalse("JobTracker has opened up scheduling before all the" |
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| 174 | + " trackers were recovered", shouldSchedule); |
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| 175 | UtilsForTests.waitFor(100); |
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| 176 | |
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| 177 | // snapshot jobtracker's scheduling status |
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| 178 | shouldSchedule = jobtracker.recoveryManager.shouldSchedule(); |
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| 179 | } |
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| 180 | |
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| 181 | assertTrue("JobTracker hasnt opened up scheduling even all the" |
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| 182 | + " trackers were recovered", |
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| 183 | jobtracker.recoveryManager.shouldSchedule()); |
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| 184 | |
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| 185 | assertEquals("Recovery manager is in inconsistent state", |
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| 186 | 0, jobtracker.recoveryManager.recoveredTrackers.size()); |
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| 187 | |
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| 188 | // wait for the job to be complete |
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| 189 | UtilsForTests.waitTillDone(jobClient); |
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| 190 | } |
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| 191 | |
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| 192 | private boolean checkTrackers(JobTracker jobtracker, Set<String> present, |
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| 193 | Set<String> absent) { |
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| 194 | long jobtrackerRecoveryFinishTime = |
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| 195 | jobtracker.getStartTime() + jobtracker.getRecoveryDuration(); |
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| 196 | for (String trackerName : present) { |
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| 197 | TaskTrackerStatus status = jobtracker.getTaskTracker(trackerName); |
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| 198 | // check if the status is present and also the tracker has contacted back |
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| 199 | // after restart |
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| 200 | if (status == null |
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| 201 | || status.getLastSeen() < jobtrackerRecoveryFinishTime) { |
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| 202 | return false; |
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| 203 | } |
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| 204 | } |
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| 205 | for (String trackerName : absent) { |
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| 206 | TaskTrackerStatus status = jobtracker.getTaskTracker(trackerName); |
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| 207 | // check if the status is still present |
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| 208 | if ( status != null) { |
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| 209 | return false; |
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| 210 | } |
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| 211 | } |
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| 212 | return true; |
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| 213 | } |
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| 214 | |
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| 215 | /** |
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| 216 | * Test {@link JobTracker}'s safe mode. |
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| 217 | */ |
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| 218 | public void testJobTrackerSafeMode() throws IOException { |
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| 219 | String namenode = null; |
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| 220 | MiniDFSCluster dfs = null; |
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| 221 | MiniMRCluster mr = null; |
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| 222 | FileSystem fileSys = null; |
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| 223 | |
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| 224 | try { |
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| 225 | Configuration conf = new Configuration(); |
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| 226 | conf.setBoolean("dfs.replication.considerLoad", false); |
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| 227 | dfs = new MiniDFSCluster(conf, 1, true, null, null); |
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| 228 | dfs.waitActive(); |
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| 229 | fileSys = dfs.getFileSystem(); |
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| 230 | |
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| 231 | // clean up |
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| 232 | fileSys.delete(testDir, true); |
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| 233 | |
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| 234 | if (!fileSys.mkdirs(inDir)) { |
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| 235 | throw new IOException("Mkdirs failed to create " + inDir.toString()); |
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| 236 | } |
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| 237 | |
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| 238 | // Write the input file |
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| 239 | UtilsForTests.writeFile(dfs.getNameNode(), conf, |
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| 240 | new Path(inDir + "/file"), (short)1); |
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| 241 | |
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| 242 | dfs.startDataNodes(conf, 1, true, null, null, null, null); |
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| 243 | dfs.waitActive(); |
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| 244 | |
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| 245 | namenode = (dfs.getFileSystem()).getUri().getHost() + ":" |
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| 246 | + (dfs.getFileSystem()).getUri().getPort(); |
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| 247 | |
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| 248 | // Make sure that jobhistory leads to a proper job restart |
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| 249 | // So keep the blocksize and the buffer size small |
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| 250 | JobConf jtConf = new JobConf(); |
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| 251 | jtConf.set("mapred.jobtracker.job.history.block.size", "512"); |
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| 252 | jtConf.set("mapred.jobtracker.job.history.buffer.size", "512"); |
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| 253 | jtConf.setInt("mapred.tasktracker.map.tasks.maximum", 1); |
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| 254 | jtConf.setInt("mapred.tasktracker.reduce.tasks.maximum", 1); |
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| 255 | jtConf.setLong("mapred.tasktracker.expiry.interval", 5000); |
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| 256 | jtConf.setInt("mapred.reduce.copy.backoff", 4); |
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| 257 | jtConf.setLong("mapred.job.reuse.jvm.num.tasks", -1); |
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| 258 | |
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| 259 | mr = new MiniMRCluster(numTrackers, namenode, numDir, null, null, jtConf); |
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| 260 | |
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| 261 | // Test Lost tracker case |
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| 262 | testSafeMode(dfs, mr); |
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| 263 | } finally { |
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| 264 | if (mr != null) { |
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| 265 | try { |
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| 266 | mr.shutdown(); |
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| 267 | } catch (Exception e) {} |
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| 268 | } |
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| 269 | if (dfs != null) { |
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| 270 | try { |
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| 271 | dfs.shutdown(); |
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| 272 | } catch (Exception e) {} |
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| 273 | } |
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| 274 | } |
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| 275 | } |
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| 276 | |
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| 277 | public static void main(String[] args) throws IOException { |
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| 278 | new TestJobTrackerSafeMode().testJobTrackerSafeMode(); |
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| 279 | } |
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| 280 | } |
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