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 java.io.DataOutputStream; |
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21 | import java.io.IOException; |
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22 | import java.io.InputStream; |
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23 | import java.net.URI; |
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24 | |
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25 | import junit.framework.TestCase; |
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26 | |
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27 | import org.apache.commons.logging.Log; |
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28 | import org.apache.commons.logging.LogFactory; |
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29 | import org.apache.hadoop.conf.Configuration; |
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30 | import org.apache.hadoop.hdfs.MiniDFSCluster; |
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31 | import org.apache.hadoop.filecache.DistributedCache; |
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32 | import org.apache.hadoop.fs.FileSystem; |
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33 | import org.apache.hadoop.fs.Path; |
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34 | import org.apache.hadoop.io.IntWritable; |
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35 | import org.apache.hadoop.io.LongWritable; |
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36 | import org.apache.hadoop.io.Text; |
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37 | import org.apache.hadoop.mapred.lib.IdentityReducer; |
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38 | |
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39 | /** |
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40 | * Class to test mapred debug Script |
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41 | */ |
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42 | public class TestMiniMRMapRedDebugScript extends TestCase { |
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43 | private static final Log LOG = |
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44 | LogFactory.getLog(TestMiniMRMapRedDebugScript.class.getName()); |
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45 | |
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46 | private MiniMRCluster mr; |
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47 | private MiniDFSCluster dfs; |
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48 | private FileSystem fileSys; |
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49 | |
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50 | /** |
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51 | * Fail map class |
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52 | */ |
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53 | public static class MapClass extends MapReduceBase |
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54 | implements Mapper<LongWritable, Text, Text, IntWritable> { |
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55 | public void map (LongWritable key, Text value, |
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56 | OutputCollector<Text, IntWritable> output, |
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57 | Reporter reporter) throws IOException { |
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58 | System.err.println("Bailing out"); |
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59 | throw new IOException(); |
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60 | } |
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61 | } |
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62 | |
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63 | /** |
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64 | * Reads tasklog and returns it as string after trimming it. |
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65 | * @param filter Task log filter; can be STDOUT, STDERR, |
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66 | * SYSLOG, DEBUGOUT, DEBUGERR |
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67 | * @param taskId The task id for which the log has to collected |
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68 | * @param isCleanup whether the task is a cleanup attempt or not. |
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69 | * @return task log as string |
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70 | * @throws IOException |
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71 | */ |
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72 | public static String readTaskLog(TaskLog.LogName filter, |
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73 | TaskAttemptID taskId, |
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74 | boolean isCleanup) |
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75 | throws IOException { |
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76 | // string buffer to store task log |
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77 | StringBuffer result = new StringBuffer(); |
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78 | int res; |
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79 | |
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80 | // reads the whole tasklog into inputstream |
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81 | InputStream taskLogReader = new TaskLog.Reader(taskId, filter, 0, -1, isCleanup); |
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82 | // construct string log from inputstream. |
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83 | byte[] b = new byte[65536]; |
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84 | while (true) { |
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85 | res = taskLogReader.read(b); |
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86 | if (res > 0) { |
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87 | result.append(new String(b)); |
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88 | } else { |
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89 | break; |
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90 | } |
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91 | } |
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92 | taskLogReader.close(); |
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93 | |
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94 | // trim the string and return it |
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95 | String str = result.toString(); |
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96 | str = str.trim(); |
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97 | return str; |
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98 | } |
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99 | |
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100 | /** |
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101 | * Launches failed map task and debugs the failed task |
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102 | * @param conf configuration for the mapred job |
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103 | * @param inDir input path |
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104 | * @param outDir output path |
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105 | * @param debugDir debug directory where script is present |
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106 | * @param debugCommand The command to execute script |
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107 | * @param input Input text |
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108 | * @return the output of debug script |
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109 | * @throws IOException |
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110 | */ |
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111 | public String launchFailMapAndDebug(JobConf conf, |
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112 | Path inDir, |
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113 | Path outDir, |
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114 | Path debugDir, |
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115 | String debugScript, |
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116 | String input) |
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117 | throws IOException { |
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118 | |
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119 | // set up the input file system and write input text. |
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120 | FileSystem inFs = inDir.getFileSystem(conf); |
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121 | FileSystem outFs = outDir.getFileSystem(conf); |
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122 | outFs.delete(outDir, true); |
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123 | if (!inFs.mkdirs(inDir)) { |
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124 | throw new IOException("Mkdirs failed to create " + inDir.toString()); |
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125 | } |
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126 | { |
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127 | // write input into input file |
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128 | DataOutputStream file = inFs.create(new Path(inDir, "part-0")); |
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129 | file.writeBytes(input); |
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130 | file.close(); |
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131 | } |
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132 | |
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133 | // configure the mapred Job for failing map task. |
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134 | conf.setJobName("failmap"); |
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135 | conf.setMapperClass(MapClass.class); |
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136 | conf.setReducerClass(IdentityReducer.class); |
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137 | conf.setNumMapTasks(1); |
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138 | conf.setNumReduceTasks(0); |
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139 | conf.setMapDebugScript(debugScript); |
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140 | FileInputFormat.setInputPaths(conf, inDir); |
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141 | FileOutputFormat.setOutputPath(conf, outDir); |
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142 | String TEST_ROOT_DIR = new Path(System.getProperty("test.build.data", |
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143 | "/tmp")).toString().replace(' ', '+'); |
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144 | conf.set("test.build.data", TEST_ROOT_DIR); |
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145 | |
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146 | // copy debug script to cache from local file system. |
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147 | FileSystem debugFs = debugDir.getFileSystem(conf); |
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148 | Path scriptPath = new Path(debugDir,"testscript.txt"); |
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149 | Path cachePath = new Path("/cacheDir"); |
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150 | if (!debugFs.mkdirs(cachePath)) { |
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151 | throw new IOException("Mkdirs failed to create " + cachePath.toString()); |
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152 | } |
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153 | debugFs.copyFromLocalFile(scriptPath,cachePath); |
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154 | |
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155 | URI uri = debugFs.getUri().resolve(cachePath+"/testscript.txt#testscript"); |
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156 | DistributedCache.createSymlink(conf); |
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157 | DistributedCache.addCacheFile(uri, conf); |
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158 | |
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159 | RunningJob job =null; |
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160 | // run the job. It will fail with IOException. |
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161 | try { |
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162 | job = new JobClient(conf).submitJob(conf); |
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163 | } catch (IOException e) { |
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164 | LOG.info("Running Job failed", e); |
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165 | } |
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166 | |
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167 | JobID jobId = job.getID(); |
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168 | // construct the task id of first map task of failmap |
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169 | TaskAttemptID taskId = new TaskAttemptID(new TaskID(jobId,true, 0), 0); |
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170 | // wait for the job to finish. |
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171 | while (!job.isComplete()) ; |
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172 | |
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173 | // return the output of debugout log. |
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174 | return readTaskLog(TaskLog.LogName.DEBUGOUT,taskId, false); |
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175 | } |
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176 | |
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177 | /** |
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178 | * Tests Map task's debug script |
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179 | * |
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180 | * In this test, we launch a mapreduce program which |
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181 | * writes 'Bailing out' to stderr and throws an exception. |
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182 | * We will run the script when tsk fails and validate |
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183 | * the output of debug out log. |
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184 | * |
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185 | */ |
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186 | public void testMapDebugScript() throws Exception { |
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187 | try { |
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188 | |
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189 | // create configuration, dfs, file system and mapred cluster |
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190 | Configuration cnf = new Configuration(); |
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191 | dfs = new MiniDFSCluster(cnf, 1, true, null); |
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192 | fileSys = dfs.getFileSystem(); |
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193 | mr = new MiniMRCluster(2, fileSys.getName(), 1); |
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194 | JobConf conf = mr.createJobConf(); |
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195 | |
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196 | // intialize input, output and debug directories |
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197 | final Path debugDir = new Path("build/test/debug"); |
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198 | Path inDir = new Path("testing/wc/input"); |
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199 | Path outDir = new Path("testing/wc/output"); |
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200 | |
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201 | // initialize debug command and input text |
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202 | String debugScript = "./testscript"; |
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203 | String input = "The input"; |
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204 | |
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205 | // Launch failed map task and run debug script |
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206 | String result = launchFailMapAndDebug(conf,inDir, |
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207 | outDir,debugDir, debugScript, input); |
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208 | |
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209 | // Assert the output of debug script. |
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210 | assertTrue(result.contains("Test Script\nBailing out")); |
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211 | |
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212 | } finally { |
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213 | // close file system and shut down dfs and mapred cluster |
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214 | try { |
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215 | if (fileSys != null) { |
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216 | fileSys.close(); |
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217 | } |
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218 | if (dfs != null) { |
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219 | dfs.shutdown(); |
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220 | } |
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221 | if (mr != null) { |
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222 | mr.shutdown(); |
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223 | } |
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224 | } catch (IOException ioe) { |
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225 | LOG.info("IO exception in closing file system:"+ioe.getMessage(), ioe); |
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226 | } |
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227 | } |
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228 | } |
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229 | |
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230 | public static void main(String args[]){ |
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231 | TestMiniMRMapRedDebugScript tmds = new TestMiniMRMapRedDebugScript(); |
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232 | try { |
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233 | tmds.testMapDebugScript(); |
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234 | } catch (Exception e) { |
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235 | LOG.error("Exception in test: "+e.getMessage(), e); |
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236 | } |
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237 | } |
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238 | |
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239 | } |
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240 | |
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