[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.hadoop.conf.Configuration; |
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| 21 | import org.apache.hadoop.fs.*; |
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| 22 | import org.apache.hadoop.hdfs.MiniDFSCluster; |
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| 23 | import org.apache.hadoop.mapred.TestJobTrackerRestart; |
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| 24 | |
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| 25 | import junit.framework.TestCase; |
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| 26 | import java.io.*; |
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| 27 | |
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| 28 | /** |
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| 29 | * This test checks if the jobtracker can detect and recover a tracker that was |
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| 30 | * lost while the jobtracker was down. |
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| 31 | */ |
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| 32 | public class TestJobTrackerRestartWithLostTracker extends TestCase { |
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| 33 | final Path testDir = new Path("/jt-restart-lost-tt-testing"); |
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| 34 | final Path inDir = new Path(testDir, "input"); |
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| 35 | final Path shareDir = new Path(testDir, "share"); |
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| 36 | final Path outputDir = new Path(testDir, "output"); |
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| 37 | |
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| 38 | private JobConf configureJob(JobConf conf, int maps, int reduces, |
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| 39 | String mapSignal, String redSignal) |
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| 40 | throws IOException { |
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| 41 | UtilsForTests.configureWaitingJobConf(conf, inDir, outputDir, |
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| 42 | maps, reduces, "test-jobtracker-restart-with-lost-tt", |
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| 43 | mapSignal, redSignal); |
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| 44 | return conf; |
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| 45 | } |
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| 46 | |
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| 47 | public void testRecoveryWithLostTracker(MiniDFSCluster dfs, |
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| 48 | MiniMRCluster mr) |
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| 49 | throws IOException { |
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| 50 | FileSystem fileSys = dfs.getFileSystem(); |
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| 51 | JobConf jobConf = mr.createJobConf(); |
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| 52 | int numMaps = 50; |
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| 53 | int numReds = 1; |
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| 54 | String mapSignalFile = UtilsForTests.getMapSignalFile(shareDir); |
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| 55 | String redSignalFile = UtilsForTests.getReduceSignalFile(shareDir); |
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| 56 | |
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| 57 | // Configure the jobs |
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| 58 | JobConf job = configureJob(jobConf, numMaps, numReds, |
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| 59 | mapSignalFile, redSignalFile); |
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| 60 | |
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| 61 | fileSys.delete(shareDir, true); |
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| 62 | |
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| 63 | // Submit a master job |
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| 64 | JobClient jobClient = new JobClient(job); |
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| 65 | RunningJob rJob = jobClient.submitJob(job); |
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| 66 | JobID id = rJob.getID(); |
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| 67 | |
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| 68 | // wait for the job to be inited |
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| 69 | mr.initializeJob(id); |
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| 70 | |
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| 71 | // Make sure that the master job is 50% completed |
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| 72 | while (UtilsForTests.getJobStatus(jobClient, id).mapProgress() |
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| 73 | < 0.5f) { |
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| 74 | UtilsForTests.waitFor(100); |
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| 75 | } |
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| 76 | |
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| 77 | // Kill the jobtracker |
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| 78 | mr.stopJobTracker(); |
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| 79 | |
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| 80 | // Signal the maps to complete |
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| 81 | UtilsForTests.signalTasks(dfs, fileSys, true, mapSignalFile, redSignalFile); |
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| 82 | |
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| 83 | // Enable recovery on restart |
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| 84 | mr.getJobTrackerConf().setBoolean("mapred.jobtracker.restart.recover", |
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| 85 | true); |
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| 86 | |
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| 87 | // Kill the 2nd tasktracker |
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| 88 | mr.stopTaskTracker(1); |
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| 89 | |
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| 90 | // Wait for a minute before submitting a job |
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| 91 | UtilsForTests.waitFor(60 * 1000); |
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| 92 | |
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| 93 | // Restart the jobtracker |
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| 94 | mr.startJobTracker(); |
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| 95 | |
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| 96 | // Check if the jobs are still running |
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| 97 | |
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| 98 | // Wait for the JT to be ready |
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| 99 | UtilsForTests.waitForJobTracker(jobClient); |
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| 100 | |
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| 101 | // Signal the reducers to complete |
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| 102 | UtilsForTests.signalTasks(dfs, fileSys, false, mapSignalFile, |
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| 103 | redSignalFile); |
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| 104 | |
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| 105 | UtilsForTests.waitTillDone(jobClient); |
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| 106 | |
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| 107 | // Check if the tasks on the lost tracker got re-executed |
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| 108 | assertEquals("Tracker killed while the jobtracker was down did not get lost " |
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| 109 | + "upon restart", |
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| 110 | jobClient.getClusterStatus().getTaskTrackers(), 1); |
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| 111 | |
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| 112 | // validate the history file |
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| 113 | TestJobHistory.validateJobHistoryFileFormat(id, job, "SUCCESS", true); |
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| 114 | TestJobHistory.validateJobHistoryFileContent(mr, rJob, job); |
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| 115 | } |
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| 116 | |
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| 117 | public void testRestartWithLostTracker() throws IOException { |
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| 118 | String namenode = null; |
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| 119 | MiniDFSCluster dfs = null; |
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| 120 | MiniMRCluster mr = null; |
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| 121 | FileSystem fileSys = null; |
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| 122 | |
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| 123 | try { |
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| 124 | Configuration conf = new Configuration(); |
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| 125 | conf.setBoolean("dfs.replication.considerLoad", false); |
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| 126 | dfs = new MiniDFSCluster(conf, 1, true, null, null); |
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| 127 | dfs.waitActive(); |
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| 128 | fileSys = dfs.getFileSystem(); |
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| 129 | |
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| 130 | // clean up |
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| 131 | fileSys.delete(testDir, true); |
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| 132 | |
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| 133 | if (!fileSys.mkdirs(inDir)) { |
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| 134 | throw new IOException("Mkdirs failed to create " + inDir.toString()); |
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| 135 | } |
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| 136 | |
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| 137 | // Write the input file |
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| 138 | UtilsForTests.writeFile(dfs.getNameNode(), conf, |
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| 139 | new Path(inDir + "/file"), (short)1); |
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| 140 | |
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| 141 | dfs.startDataNodes(conf, 1, true, null, null, null, null); |
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| 142 | dfs.waitActive(); |
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| 143 | |
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| 144 | namenode = (dfs.getFileSystem()).getUri().getHost() + ":" |
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| 145 | + (dfs.getFileSystem()).getUri().getPort(); |
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| 146 | |
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| 147 | // Make sure that jobhistory leads to a proper job restart |
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| 148 | // So keep the blocksize and the buffer size small |
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| 149 | JobConf jtConf = new JobConf(); |
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| 150 | jtConf.set("mapred.jobtracker.job.history.block.size", "1024"); |
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| 151 | jtConf.set("mapred.jobtracker.job.history.buffer.size", "1024"); |
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| 152 | jtConf.setInt("mapred.tasktracker.reduce.tasks.maximum", 1); |
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| 153 | jtConf.setLong("mapred.tasktracker.expiry.interval", 25 * 1000); |
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| 154 | jtConf.setInt("mapred.reduce.copy.backoff", 4); |
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| 155 | |
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| 156 | mr = new MiniMRCluster(2, namenode, 1, null, null, jtConf); |
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| 157 | |
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| 158 | // Test Lost tracker case |
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| 159 | testRecoveryWithLostTracker(dfs, mr); |
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| 160 | } finally { |
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| 161 | if (mr != null) { |
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| 162 | try { |
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| 163 | mr.shutdown(); |
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| 164 | } catch (Exception e) {} |
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| 165 | } |
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| 166 | if (dfs != null) { |
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| 167 | try { |
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| 168 | dfs.shutdown(); |
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| 169 | } catch (Exception e) {} |
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| 170 | } |
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| 171 | } |
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| 172 | } |
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| 173 | |
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| 174 | public static void main(String[] args) throws IOException { |
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| 175 | new TestJobTrackerRestartWithLostTracker().testRestartWithLostTracker(); |
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| 176 | } |
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| 177 | } |
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