1 | import java.io.BufferedReader; |
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2 | import java.io.ByteArrayInputStream; |
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3 | import java.io.ByteArrayOutputStream; |
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4 | import java.io.DataInputStream; |
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5 | import java.io.File; |
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6 | import java.io.File; |
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7 | import java.io.FileReader; |
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8 | import java.io.FileWriter; |
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9 | import java.io.IOException; |
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10 | import java.io.InputStreamReader; |
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11 | import java.io.ObjectInputStream; |
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12 | import java.io.ObjectOutputStream; |
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13 | import java.io.PrintWriter; |
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14 | import java.lang.Thread; |
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15 | import java.net.ServerSocket; |
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16 | import java.net.Socket; |
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17 | import java.net.URL; |
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18 | import java.net.URLClassLoader; |
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19 | import java.net.URLDecoder; |
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20 | import java.util.ArrayList; |
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21 | import java.util.Enumeration; |
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22 | import java.util.StringTokenizer; |
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23 | import org.apache.hadoop.conf.Configuration; |
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24 | import org.apache.hadoop.filecache.DistributedCache; |
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25 | import org.apache.hadoop.fs.FileSystem; |
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26 | import org.apache.hadoop.fs.Path; |
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27 | import org.apache.hadoop.io.Text; |
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28 | import org.apache.hadoop.mapred.JobConf; |
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29 | import org.apache.hadoop.mapreduce.Job; |
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30 | import org.apache.hadoop.mapreduce.Mapper; |
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31 | import org.apache.hadoop.mapreduce.Reducer; |
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32 | import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; |
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33 | import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat; |
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34 | import org.apache.hadoop.mapreduce.lib.reduce.IntSumReducer; |
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35 | import org.junit.runner.Description; |
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36 | import org.junit.runner.JUnitCore; |
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37 | import org.junit.runner.Request; |
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38 | import org.junit.runner.Result; |
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39 | import org.junit.runner.Runner; |
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40 | import org.junit.runner.manipulation.Filter; |
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41 | import org.junit.runner.manipulation.NoTestsRemainException; |
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42 | import org.junit.runner.notification.Failure; |
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43 | import org.junit.runner.notification.RunNotifier; |
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44 | import org.junit.runners.JUnit4; |
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45 | |
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46 | |
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47 | public class HadoopRunner extends Runner { |
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48 | |
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49 | /* TODO(mgruber): Place host port pair into the xml config, |
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50 | * under junit.classloader. |
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51 | */ |
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52 | private static final int HADOOP_LOADER_PORT = 9002; |
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53 | private static final String HADOOP_LOADER_HOST = "imac.local"; |
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54 | private static Thread resourceServer; |
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55 | |
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56 | public static class JUnitMapper |
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57 | extends Mapper<Object, Text, Text, Text> |
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58 | { |
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59 | Configuration conf; |
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60 | private Text word = new Text(); |
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61 | private static ClassLoader loader; |
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62 | |
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63 | public class JUnitClassLoader extends ClassLoader { |
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64 | FileSystem hdfs; |
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65 | |
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66 | String host; |
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67 | int port; |
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68 | |
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69 | public JUnitClassLoader(String host, int port) { |
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70 | try { |
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71 | this.host = host; |
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72 | this.port = port; |
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73 | String location = this.getClass().getProtectionDomain(). |
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74 | getCodeSource(). |
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75 | getLocation(). |
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76 | getFile(); |
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77 | hdfs = new Path(location).getFileSystem(conf); |
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78 | } |
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79 | catch (Exception e) { |
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80 | e.printStackTrace(); |
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81 | } |
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82 | } |
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83 | /*! Connect to master, and request class file. */ |
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84 | public Class findClass(String name) { |
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85 | try { |
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86 | /* Create a new connection. */ |
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87 | Socket socket = new Socket(host, port); |
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88 | PrintWriter writer = new PrintWriter(socket. |
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89 | getOutputStream()); |
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90 | BufferedReader reader = |
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91 | new BufferedReader(new InputStreamReader(socket. |
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92 | getInputStream())); |
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93 | /* Send the class name. */ |
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94 | writer.println(name); |
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95 | writer.flush(); |
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96 | /* Get the location of the class. */ |
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97 | String resourceFile = reader.readLine(); |
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98 | if (resourceFile.endsWith(".jar")) { |
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99 | throw new Exception("Not implemented"); |
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100 | } |
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101 | else { |
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102 | /* Open the class file from hdfs. */ |
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103 | Path resourcePath = new Path(resourceFile); |
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104 | DataInputStream input = hdfs.open(resourcePath); |
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105 | long length = resourcePath.getFileSystem(conf). |
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106 | getFileStatus(resourcePath).getLen(); |
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107 | byte b[] = new byte[(int) length]; |
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108 | input.readFully(b); |
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109 | socket.close(); |
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110 | return defineClass(name, b, 0, b.length); |
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111 | } |
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112 | } |
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113 | catch (Exception e) { |
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114 | /* Nothing to do. */ |
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115 | e.printStackTrace(); |
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116 | } |
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117 | return null; |
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118 | } |
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119 | }; |
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120 | |
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121 | @Override |
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122 | protected void setup(Mapper.Context context) { |
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123 | conf = context.getConfiguration(); |
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124 | loader = new JUnitClassLoader(HADOOP_LOADER_HOST, |
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125 | HADOOP_LOADER_PORT); |
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126 | } |
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127 | |
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128 | public void map(Object key, Text value, Context context) |
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129 | throws IOException, InterruptedException { |
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130 | StringTokenizer tokenizer = |
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131 | new StringTokenizer(value.toString()); |
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132 | if (tokenizer.countTokens() != 2) |
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133 | throw new IOException(); |
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134 | /* The first token is a org.junit.runner.Description for the |
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135 | * test class, and the second for the test method. |
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136 | */ |
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137 | String className = tokenizer.nextToken(); |
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138 | final String methodDescription = tokenizer.nextToken(); |
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139 | try { |
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140 | Class testClass = loader.loadClass(className); |
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141 | /* Create a local JUnit runner for this class. */ |
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142 | JUnit4 runner = new JUnit4(testClass); |
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143 | runner.filter( |
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144 | new Filter() { |
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145 | @Override |
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146 | public boolean shouldRun(Description description) { |
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147 | return methodDescription.equals(description. |
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148 | toString()); |
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149 | } |
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150 | @Override |
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151 | public String describe() { |
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152 | return null; |
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153 | } |
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154 | } |
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155 | ); |
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156 | /* Run with local runner. */ |
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157 | Result result = new JUnitCore().run(runner); |
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158 | |
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159 | /* Since we filter out a single test, we can assert the |
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160 | * following: |
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161 | */ |
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162 | assert result.getFailures().size() < 2; |
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163 | /* Collect the result in a list. If the list is empty, |
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164 | * no failures occured. We do this, since Result is not |
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165 | * serializable. |
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166 | */ |
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167 | ArrayList<Throwable> outcome = new ArrayList<Throwable>(); |
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168 | ByteArrayOutputStream byteStream = |
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169 | new ByteArrayOutputStream(); |
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170 | ObjectOutputStream objectStream = |
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171 | new ObjectOutputStream(byteStream); |
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172 | |
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173 | for (Failure failure: result.getFailures()) { |
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174 | Throwable exception = failure.getException(); |
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175 | /* Serialize the exception into a byte array. */ |
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176 | |
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177 | outcome.add(exception); |
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178 | } |
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179 | objectStream.writeObject(outcome); |
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180 | /* Get the backing byte array. */ |
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181 | byte[] bytes = byteStream.toByteArray(); |
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182 | context.write(new Text(methodDescription), |
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183 | new Text(Base64.byteArrayToBase64(bytes))); |
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184 | } |
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185 | catch (NoTestsRemainException e) { |
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186 | System.out.println(e.toString()); |
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187 | } |
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188 | catch (Exception e) { |
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189 | /* TODO: Output something in the mapper. */ |
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190 | e.printStackTrace(); |
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191 | throw new IOException(); |
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192 | } |
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193 | } |
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194 | } |
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195 | |
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196 | public static class IdentityReducer |
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197 | extends Reducer<Text, Text, Text, Text> |
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198 | { |
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199 | public void reduce(Text key, Iterable<Text> values, Context context) |
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200 | throws IOException, InterruptedException { |
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201 | System.out.println(key); |
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202 | /* TODO: Make better use of the aggregated failure descriptions. */ |
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203 | for (Text value: values) { |
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204 | context.write(key, value); |
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205 | System.out.println(value); |
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206 | } |
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207 | } |
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208 | } |
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209 | |
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210 | Class testClass; |
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211 | private final Runner delegate; |
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212 | private final String HADOOP_RUNNER = "hadoop_runner"; |
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213 | private final String TMP_FILE_NAME = "junit_tests"; |
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214 | private final String OUTPUT_DIR_NAME = "junit_results"; |
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215 | private final String OUTPUT_FILE_PREFIX = "part-r-"; |
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216 | private final String JAR_FILE_NAME = "junit-runner-0.1.jar"; |
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217 | |
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218 | |
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219 | |
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220 | public Description getDescription() { |
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221 | return delegate.getDescription(); |
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222 | } |
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223 | |
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224 | public void doMapReduce(Path in, Path out) throws Exception { |
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225 | Configuration conf = new Configuration(); |
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226 | /* Add the JUnit jar to the distributed cache, for the mappers. */ |
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227 | Job job = new Job(conf, HADOOP_RUNNER); |
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228 | /* NOTE: File has been already copied to hdfs, the Path refers to |
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229 | * a hdfs location. |
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230 | */ |
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231 | DistributedCache.addFileToClassPath(new Path(JUnit4.class. |
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232 | getProtectionDomain(). |
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233 | getCodeSource(). |
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234 | getLocation(). |
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235 | getFile()), |
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236 | job.getConfiguration()); |
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237 | ((JobConf) (job.getConfiguration())).setJar(JAR_FILE_NAME); |
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238 | job.setMapperClass(JUnitMapper.class); |
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239 | job.setReducerClass(IdentityReducer.class); |
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240 | job.setOutputKeyClass(Text.class); |
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241 | job.setOutputValueClass(Text.class); |
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242 | FileInputFormat.addInputPath(job, in); |
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243 | TextOutputFormat.setOutputPath(job, out); |
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244 | job.waitForCompletion(true); |
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245 | } |
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246 | |
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247 | private Description lookupDescription(String desc) { |
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248 | for (Description d: delegate.getDescription().getChildren()) { |
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249 | if (desc.equals(d.toString())) |
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250 | return d; |
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251 | } |
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252 | /* Unreachable */ |
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253 | return null; |
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254 | } |
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255 | |
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256 | public void run(RunNotifier notifier) { |
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257 | try { |
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258 | File in = File.createTempFile(TMP_FILE_NAME, null); |
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259 | PrintWriter writer = new PrintWriter(new FileWriter(in)); |
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260 | for (Description d: delegate.getDescription().getChildren()) { |
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261 | notifier.fireTestStarted(d); |
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262 | /* Write the description of the test class and the method. */ |
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263 | writer.println(delegate.getDescription() + "\t" + d); |
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264 | /* TODO: Replace this separator by a constant. */ |
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265 | } |
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266 | writer.close(); |
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267 | |
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268 | /* Output is a folder. */ |
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269 | File out = File.createTempFile(OUTPUT_DIR_NAME, ""); |
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270 | out.delete(); |
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271 | |
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272 | FileSystem hdfs = |
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273 | new Path(in.getName()).getFileSystem(new Configuration()); |
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274 | |
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275 | /* TODO(mgruber): Copy on DFS. */ |
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276 | hdfs.copyFromLocalFile(new Path(in.getCanonicalPath()), |
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277 | new Path(in.getName())); |
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278 | |
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279 | /* TODO(mgruber): Refactor. Copy the junit jar to the lib folder. */ |
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280 | URL jUnitJarLocation = JUnit4.class.getProtectionDomain(). |
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281 | getCodeSource(). |
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282 | getLocation(); |
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283 | hdfs.copyFromLocalFile(new Path(jUnitJarLocation.getPath()), |
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284 | new Path(jUnitJarLocation.getFile())); |
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285 | /* Do the stuff. */ |
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286 | doMapReduce(new Path(in.getName()), new Path(out.getName())); |
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287 | |
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288 | hdfs.copyToLocalFile(new Path(out.getName()), |
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289 | new Path(out.getCanonicalPath())); |
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290 | |
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291 | /* Get the results, and notify the JUnit master. */ |
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292 | for (File f: out.listFiles()) { |
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293 | if (!f.getName().startsWith(OUTPUT_FILE_PREFIX)) |
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294 | continue; |
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295 | |
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296 | BufferedReader reader = new BufferedReader(new FileReader(f)); |
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297 | while (true) { |
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298 | String result = reader.readLine(); |
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299 | if (result == null) |
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300 | /* EOF */ |
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301 | break; |
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302 | /* Each line of output is a pair (Class, List<Failure>). */ |
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303 | StringTokenizer tokenizer = new StringTokenizer(result, |
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304 | "\t"); |
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305 | assert tokenizer.countTokens() == 2; |
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306 | String methodDescription = tokenizer.nextToken(); |
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307 | String outcomeDescription = tokenizer.nextToken(); |
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308 | result.substring(result.indexOf(' ') + 1); |
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309 | ArrayList<Throwable> outcome = null; |
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310 | try { |
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311 | /* Decode the failure description, and create a |
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312 | * Failure object. |
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313 | */ |
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314 | byte[] bytes = |
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315 | Base64.base64ToByteArray(outcomeDescription); |
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316 | |
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317 | ByteArrayInputStream byteStream = |
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318 | new ByteArrayInputStream(bytes); |
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319 | ObjectInputStream objectStream = |
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320 | new ObjectInputStream(byteStream); |
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321 | outcome = |
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322 | (ArrayList<Throwable>) objectStream.readObject(); |
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323 | } |
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324 | catch (Exception e) { |
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325 | /* TODO: Handle the exception. */ |
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326 | e.printStackTrace(); |
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327 | assert false; |
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328 | } |
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329 | |
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330 | Description d = lookupDescription(methodDescription); |
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331 | assert d != null; |
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332 | if (outcome.size() > 0) { |
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333 | notifier.fireTestFailure(new Failure(d, |
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334 | outcome.get(0))); |
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335 | } |
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336 | notifier.fireTestFinished(d); |
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337 | } |
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338 | } |
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339 | |
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340 | } |
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341 | catch (Exception e) { |
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342 | e.printStackTrace(); |
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343 | } |
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344 | } |
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345 | |
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346 | public HadoopRunner(Class testClass) throws Exception { |
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347 | this.testClass = testClass; |
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348 | this.delegate = new JUnit4(testClass); |
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349 | |
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350 | Thread server = new Thread() { |
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351 | @Override |
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352 | public void run() { |
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353 | try { |
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354 | ServerSocket server = new ServerSocket(HADOOP_LOADER_PORT); |
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355 | while (true) { |
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356 | Socket client = server.accept(); |
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357 | BufferedReader reader = |
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358 | new BufferedReader(new InputStreamReader(client.getInputStream())); |
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359 | String className = reader.readLine(); |
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360 | PrintWriter writer = new PrintWriter(client. |
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361 | getOutputStream()); |
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362 | /* Find the requested class, and place it in a hdfs |
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363 | * location. |
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364 | */ |
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365 | try { |
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366 | /* Copy to hdfs. */ |
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367 | Class req = Class.forName(className); |
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368 | String location = req.getProtectionDomain(). |
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369 | getCodeSource(). |
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370 | getLocation(). |
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371 | getFile(); |
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372 | File classFile = new File(location); |
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373 | if (classFile.isDirectory()) { |
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374 | /* Name the class. */ |
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375 | location += className + ".class"; |
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376 | } |
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377 | else { |
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378 | /* Class came from a jar. */ |
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379 | assert location.endsWith(".jar"); |
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380 | } |
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381 | |
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382 | FileSystem hdfs = |
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383 | new Path(location).getFileSystem(new Configuration()); |
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384 | /* TODO: Clear this location at job start, and |
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385 | * don't overwrite during subsequent calls. |
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386 | */ |
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387 | hdfs.copyFromLocalFile(false, |
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388 | true, |
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389 | new Path(location), |
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390 | new Path(location)); |
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391 | writer.println(location); |
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392 | writer.flush(); |
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393 | } |
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394 | catch (Exception e) { |
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395 | /* Nothing to do, class was not found. */ |
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396 | e.printStackTrace(); |
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397 | } |
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398 | client.close(); |
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399 | } |
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400 | } |
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401 | catch (Exception e) { |
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402 | e.printStackTrace(); |
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403 | } |
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404 | } |
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405 | }; |
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406 | |
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407 | /* We only need one instance of the resource server per process. */ |
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408 | synchronized (this) { |
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409 | if (resourceServer == null) { |
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410 | resourceServer = server; |
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411 | server.start(); |
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412 | } |
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413 | } |
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414 | } |
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415 | } |
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