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 | |
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19 | package org.apache.hadoop.mapred; |
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20 | |
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21 | import java.io.BufferedReader; |
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22 | import java.io.DataOutputStream; |
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23 | import java.io.File; |
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24 | import java.io.IOException; |
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25 | import java.io.InputStreamReader; |
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26 | import java.util.ArrayList; |
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27 | import java.util.Arrays; |
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28 | import java.util.List; |
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29 | |
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30 | import junit.framework.TestCase; |
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31 | |
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32 | import org.apache.commons.logging.Log; |
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33 | import org.apache.commons.logging.LogFactory; |
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34 | import org.apache.hadoop.conf.Configuration; |
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35 | import org.apache.hadoop.hdfs.MiniDFSCluster; |
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36 | import org.apache.hadoop.hdfs.server.namenode.NameNode; |
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37 | import org.apache.hadoop.fs.FileSystem; |
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38 | import org.apache.hadoop.fs.FileUtil; |
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39 | import org.apache.hadoop.fs.Path; |
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40 | import org.apache.hadoop.io.IntWritable; |
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41 | import org.apache.hadoop.io.Text; |
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42 | |
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43 | /** |
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44 | * A JUnit test to test Mini Map-Reduce Cluster with Mini-DFS. |
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45 | */ |
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46 | public class TestMiniMRWithDFS extends TestCase { |
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47 | private static final Log LOG = |
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48 | LogFactory.getLog(TestMiniMRWithDFS.class.getName()); |
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49 | |
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50 | static final int NUM_MAPS = 10; |
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51 | static final int NUM_SAMPLES = 100000; |
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52 | |
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53 | public static class TestResult { |
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54 | public String output; |
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55 | public RunningJob job; |
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56 | TestResult(RunningJob job, String output) { |
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57 | this.job = job; |
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58 | this.output = output; |
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59 | } |
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60 | } |
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61 | public static TestResult launchWordCount(JobConf conf, |
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62 | Path inDir, |
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63 | Path outDir, |
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64 | String input, |
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65 | int numMaps, |
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66 | int numReduces) throws IOException { |
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67 | FileSystem inFs = inDir.getFileSystem(conf); |
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68 | FileSystem outFs = outDir.getFileSystem(conf); |
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69 | outFs.delete(outDir, true); |
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70 | if (!inFs.mkdirs(inDir)) { |
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71 | throw new IOException("Mkdirs failed to create " + inDir.toString()); |
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72 | } |
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73 | { |
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74 | DataOutputStream file = inFs.create(new Path(inDir, "part-0")); |
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75 | file.writeBytes(input); |
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76 | file.close(); |
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77 | } |
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78 | conf.setJobName("wordcount"); |
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79 | conf.setInputFormat(TextInputFormat.class); |
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80 | |
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81 | // the keys are words (strings) |
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82 | conf.setOutputKeyClass(Text.class); |
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83 | // the values are counts (ints) |
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84 | conf.setOutputValueClass(IntWritable.class); |
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85 | |
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86 | conf.setMapperClass(WordCount.MapClass.class); |
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87 | conf.setCombinerClass(WordCount.Reduce.class); |
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88 | conf.setReducerClass(WordCount.Reduce.class); |
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89 | FileInputFormat.setInputPaths(conf, inDir); |
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90 | FileOutputFormat.setOutputPath(conf, outDir); |
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91 | conf.setNumMapTasks(numMaps); |
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92 | conf.setNumReduceTasks(numReduces); |
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93 | RunningJob job = JobClient.runJob(conf); |
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94 | return new TestResult(job, readOutput(outDir, conf)); |
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95 | } |
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96 | |
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97 | public static String readOutput(Path outDir, |
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98 | JobConf conf) throws IOException { |
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99 | FileSystem fs = outDir.getFileSystem(conf); |
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100 | StringBuffer result = new StringBuffer(); |
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101 | { |
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102 | |
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103 | Path[] fileList = FileUtil.stat2Paths(fs.listStatus(outDir, |
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104 | new OutputLogFilter())); |
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105 | for(int i=0; i < fileList.length; ++i) { |
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106 | LOG.info("File list[" + i + "]" + ": "+ fileList[i]); |
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107 | BufferedReader file = |
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108 | new BufferedReader(new InputStreamReader(fs.open(fileList[i]))); |
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109 | String line = file.readLine(); |
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110 | while (line != null) { |
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111 | result.append(line); |
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112 | result.append("\n"); |
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113 | line = file.readLine(); |
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114 | } |
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115 | file.close(); |
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116 | } |
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117 | } |
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118 | return result.toString(); |
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119 | } |
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120 | |
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121 | /** |
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122 | * Make sure that there are exactly the directories that we expect to find. |
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123 | * @param mr the map-reduce cluster |
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124 | * @param taskDirs the task ids that should be present |
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125 | */ |
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126 | static void checkTaskDirectories(MiniMRCluster mr, |
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127 | String[] jobIds, |
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128 | String[] taskDirs) { |
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129 | mr.waitUntilIdle(); |
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130 | int trackers = mr.getNumTaskTrackers(); |
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131 | List<String> neededDirs = new ArrayList<String>(Arrays.asList(taskDirs)); |
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132 | boolean[] found = new boolean[taskDirs.length]; |
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133 | for(int i=0; i < trackers; ++i) { |
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134 | int numNotDel = 0; |
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135 | File localDir = new File(mr.getTaskTrackerLocalDir(i)); |
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136 | LOG.debug("Tracker directory: " + localDir); |
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137 | File trackerDir = new File(localDir, "taskTracker"); |
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138 | assertTrue("local dir " + localDir + " does not exist.", |
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139 | localDir.isDirectory()); |
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140 | assertTrue("task tracker dir " + trackerDir + " does not exist.", |
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141 | trackerDir.isDirectory()); |
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142 | String contents[] = localDir.list(); |
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143 | String trackerContents[] = trackerDir.list(); |
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144 | for(int j=0; j < contents.length; ++j) { |
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145 | System.out.println("Local " + localDir + ": " + contents[j]); |
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146 | } |
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147 | for(int j=0; j < trackerContents.length; ++j) { |
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148 | System.out.println("Local jobcache " + trackerDir + ": " + trackerContents[j]); |
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149 | } |
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150 | for(int fileIdx = 0; fileIdx < contents.length; ++fileIdx) { |
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151 | String name = contents[fileIdx]; |
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152 | if (!("taskTracker".equals(contents[fileIdx]))) { |
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153 | LOG.debug("Looking at " + name); |
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154 | assertTrue("Spurious directory " + name + " found in " + |
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155 | localDir, false); |
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156 | } |
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157 | } |
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158 | for (int idx = 0; idx < neededDirs.size(); ++idx) { |
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159 | String name = neededDirs.get(idx); |
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160 | if (new File(new File(new File(trackerDir, "jobcache"), |
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161 | jobIds[idx]), name).isDirectory()) { |
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162 | found[idx] = true; |
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163 | numNotDel++; |
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164 | } |
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165 | } |
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166 | } |
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167 | for(int i=0; i< found.length; i++) { |
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168 | assertTrue("Directory " + taskDirs[i] + " not found", found[i]); |
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169 | } |
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170 | } |
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171 | |
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172 | public static void runPI(MiniMRCluster mr, JobConf jobconf) throws IOException { |
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173 | LOG.info("runPI"); |
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174 | double estimate = org.apache.hadoop.examples.PiEstimator.estimate( |
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175 | NUM_MAPS, NUM_SAMPLES, jobconf).doubleValue(); |
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176 | double error = Math.abs(Math.PI - estimate); |
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177 | assertTrue("Error in PI estimation "+error+" exceeds 0.01", (error < 0.01)); |
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178 | checkTaskDirectories(mr, new String[]{}, new String[]{}); |
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179 | } |
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180 | |
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181 | public static void runWordCount(MiniMRCluster mr, JobConf jobConf) |
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182 | throws IOException { |
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183 | LOG.info("runWordCount"); |
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184 | // Run a word count example |
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185 | // Keeping tasks that match this pattern |
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186 | String pattern = |
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187 | TaskAttemptID.getTaskAttemptIDsPattern(null, null, true, 1, null); |
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188 | jobConf.setKeepTaskFilesPattern(pattern); |
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189 | TestResult result; |
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190 | final Path inDir = new Path("./wc/input"); |
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191 | final Path outDir = new Path("./wc/output"); |
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192 | String input = "The quick brown fox\nhas many silly\nred fox sox\n"; |
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193 | result = launchWordCount(jobConf, inDir, outDir, input, 3, 1); |
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194 | assertEquals("The\t1\nbrown\t1\nfox\t2\nhas\t1\nmany\t1\n" + |
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195 | "quick\t1\nred\t1\nsilly\t1\nsox\t1\n", result.output); |
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196 | JobID jobid = result.job.getID(); |
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197 | TaskAttemptID taskid = new TaskAttemptID(new TaskID(jobid, true, 1),0); |
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198 | checkTaskDirectories(mr, new String[]{jobid.toString()}, |
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199 | new String[]{taskid.toString()}); |
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200 | // test with maps=0 |
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201 | jobConf = mr.createJobConf(); |
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202 | input = "owen is oom"; |
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203 | result = launchWordCount(jobConf, inDir, outDir, input, 0, 1); |
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204 | assertEquals("is\t1\noom\t1\nowen\t1\n", result.output); |
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205 | Counters counters = result.job.getCounters(); |
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206 | long hdfsRead = |
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207 | counters.findCounter(Task.FILESYSTEM_COUNTER_GROUP, |
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208 | Task.getFileSystemCounterNames("hdfs")[0]).getCounter(); |
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209 | long hdfsWrite = |
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210 | counters.findCounter(Task.FILESYSTEM_COUNTER_GROUP, |
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211 | Task.getFileSystemCounterNames("hdfs")[1]).getCounter(); |
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212 | assertEquals(result.output.length(), hdfsWrite); |
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213 | assertEquals(input.length(), hdfsRead); |
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214 | |
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215 | // Run a job with input and output going to localfs even though the |
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216 | // default fs is hdfs. |
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217 | { |
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218 | FileSystem localfs = FileSystem.getLocal(jobConf); |
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219 | String TEST_ROOT_DIR = |
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220 | new File(System.getProperty("test.build.data","/tmp")) |
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221 | .toString().replace(' ', '+'); |
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222 | Path localIn = localfs.makeQualified |
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223 | (new Path(TEST_ROOT_DIR + "/local/in")); |
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224 | Path localOut = localfs.makeQualified |
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225 | (new Path(TEST_ROOT_DIR + "/local/out")); |
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226 | result = launchWordCount(jobConf, localIn, localOut, |
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227 | "all your base belong to us", 1, 1); |
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228 | assertEquals("all\t1\nbase\t1\nbelong\t1\nto\t1\nus\t1\nyour\t1\n", |
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229 | result.output); |
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230 | assertTrue("outputs on localfs", localfs.exists(localOut)); |
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231 | |
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232 | } |
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233 | } |
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234 | |
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235 | public void testWithDFS() throws IOException { |
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236 | MiniDFSCluster dfs = null; |
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237 | MiniMRCluster mr = null; |
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238 | FileSystem fileSys = null; |
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239 | try { |
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240 | final int taskTrackers = 4; |
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241 | |
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242 | Configuration conf = new Configuration(); |
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243 | dfs = new MiniDFSCluster(conf, 4, true, null); |
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244 | fileSys = dfs.getFileSystem(); |
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245 | mr = new MiniMRCluster(taskTrackers, fileSys.getUri().toString(), 1); |
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246 | |
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247 | runPI(mr, mr.createJobConf()); |
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248 | runWordCount(mr, mr.createJobConf()); |
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249 | } finally { |
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250 | if (dfs != null) { dfs.shutdown(); } |
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251 | if (mr != null) { mr.shutdown(); |
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252 | } |
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253 | } |
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254 | } |
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255 | |
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256 | public void testWithDFSWithDefaultPort() throws IOException { |
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257 | MiniDFSCluster dfs = null; |
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258 | MiniMRCluster mr = null; |
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259 | FileSystem fileSys = null; |
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260 | try { |
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261 | final int taskTrackers = 4; |
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262 | |
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263 | Configuration conf = new Configuration(); |
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264 | // start a dfs with the default port number |
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265 | dfs = new MiniDFSCluster( |
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266 | NameNode.DEFAULT_PORT, conf, 4, true, true, null, null); |
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267 | fileSys = dfs.getFileSystem(); |
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268 | mr = new MiniMRCluster(taskTrackers, fileSys.getUri().toString(), 1); |
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269 | |
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270 | JobConf jobConf = mr.createJobConf(); |
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271 | TestResult result; |
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272 | final Path inDir = new Path("./wc/input"); |
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273 | final Path outDir = new Path("hdfs://" + |
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274 | dfs.getNameNode().getNameNodeAddress().getHostName() + |
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275 | ":" + NameNode.DEFAULT_PORT +"/./wc/output"); |
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276 | String input = "The quick brown fox\nhas many silly\nred fox sox\n"; |
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277 | result = launchWordCount(jobConf, inDir, outDir, input, 3, 1); |
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278 | assertEquals("The\t1\nbrown\t1\nfox\t2\nhas\t1\nmany\t1\n" + |
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279 | "quick\t1\nred\t1\nsilly\t1\nsox\t1\n", result.output); |
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280 | final Path outDir2 = new Path("hdfs:/test/wc/output2"); |
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281 | jobConf.set("fs.default.name", "hdfs://localhost:" + NameNode.DEFAULT_PORT); |
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282 | result = launchWordCount(jobConf, inDir, outDir2, input, 3, 1); |
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283 | assertEquals("The\t1\nbrown\t1\nfox\t2\nhas\t1\nmany\t1\n" + |
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284 | "quick\t1\nred\t1\nsilly\t1\nsox\t1\n", result.output); |
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285 | } catch (java.net.BindException be) { |
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286 | LOG.info("Skip the test this time because can not start namenode on port " |
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287 | + NameNode.DEFAULT_PORT, be); |
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288 | } finally { |
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289 | if (dfs != null) { dfs.shutdown(); } |
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290 | if (mr != null) { mr.shutdown(); |
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291 | } |
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292 | } |
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293 | } |
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294 | } |
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