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 testshell; |
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20 | |
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21 | import java.io.IOException; |
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22 | import java.util.Iterator; |
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23 | |
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24 | import org.apache.hadoop.conf.Configuration; |
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25 | import org.apache.hadoop.conf.Configured; |
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26 | import org.apache.hadoop.fs.Path; |
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27 | import org.apache.hadoop.io.IntWritable; |
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28 | import org.apache.hadoop.io.Writable; |
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29 | import org.apache.hadoop.io.WritableComparable; |
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30 | import org.apache.hadoop.mapred.FileInputFormat; |
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31 | import org.apache.hadoop.mapred.FileOutputFormat; |
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32 | import org.apache.hadoop.mapred.JobClient; |
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33 | import org.apache.hadoop.mapred.JobConf; |
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34 | import org.apache.hadoop.mapred.MapReduceBase; |
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35 | import org.apache.hadoop.mapred.Mapper; |
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36 | import org.apache.hadoop.mapred.OutputCollector; |
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37 | import org.apache.hadoop.mapred.Reducer; |
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38 | import org.apache.hadoop.mapred.Reporter; |
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39 | import org.apache.hadoop.util.Tool; |
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40 | import org.apache.hadoop.util.ToolRunner; |
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41 | |
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42 | /** |
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43 | * will be in an external jar and used for |
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44 | * test in TestJobShell.java. |
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45 | */ |
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46 | public class ExternalMapReduce extends Configured implements Tool { |
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47 | |
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48 | public void configure(JobConf job) { |
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49 | // do nothing |
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50 | } |
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51 | |
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52 | public void close() |
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53 | throws IOException { |
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54 | |
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55 | } |
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56 | |
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57 | public static class MapClass extends MapReduceBase |
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58 | implements Mapper<WritableComparable, Writable, |
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59 | WritableComparable, IntWritable> { |
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60 | public void map(WritableComparable key, Writable value, |
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61 | OutputCollector<WritableComparable, IntWritable> output, |
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62 | Reporter reporter) |
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63 | throws IOException { |
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64 | //check for classpath |
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65 | String classpath = System.getProperty("java.class.path"); |
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66 | if (classpath.indexOf("testjob.jar") == -1) { |
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67 | throw new IOException("failed to find in the library " + classpath); |
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68 | } |
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69 | //fork off ls to see if the file exists. |
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70 | // java file.exists() will not work on |
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71 | // cygwin since it is a symlink |
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72 | String[] argv = new String[2]; |
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73 | argv[0] = "ls"; |
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74 | argv[1] = "files_tmp"; |
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75 | Process p = Runtime.getRuntime().exec(argv); |
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76 | int ret = -1; |
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77 | try { |
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78 | ret = p.waitFor(); |
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79 | } catch(InterruptedException ie) { |
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80 | //do nothing here. |
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81 | } |
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82 | if (ret != 0) { |
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83 | throw new IOException("files_tmp does not exist"); |
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84 | } |
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85 | } |
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86 | } |
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87 | |
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88 | public static class Reduce extends MapReduceBase |
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89 | implements Reducer<WritableComparable, Writable, |
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90 | WritableComparable, IntWritable> { |
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91 | public void reduce(WritableComparable key, Iterator<Writable> values, |
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92 | OutputCollector<WritableComparable, IntWritable> output, |
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93 | Reporter reporter) |
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94 | throws IOException { |
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95 | //do nothing |
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96 | } |
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97 | } |
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98 | |
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99 | public int run(String[] argv) throws IOException { |
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100 | if (argv.length < 2) { |
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101 | System.out.println("ExternalMapReduce <input> <output>"); |
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102 | return -1; |
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103 | } |
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104 | Path outDir = new Path(argv[1]); |
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105 | Path input = new Path(argv[0]); |
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106 | JobConf testConf = new JobConf(getConf(), ExternalMapReduce.class); |
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107 | |
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108 | //try to load a class from libjar |
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109 | try { |
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110 | testConf.getClassByName("testjar.ClassWordCount"); |
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111 | } catch (ClassNotFoundException e) { |
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112 | System.out.println("Could not find class from libjar"); |
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113 | return -1; |
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114 | } |
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115 | |
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116 | |
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117 | testConf.setJobName("external job"); |
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118 | FileInputFormat.setInputPaths(testConf, input); |
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119 | FileOutputFormat.setOutputPath(testConf, outDir); |
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120 | testConf.setMapperClass(MapClass.class); |
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121 | testConf.setReducerClass(Reduce.class); |
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122 | testConf.setNumReduceTasks(1); |
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123 | JobClient.runJob(testConf); |
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124 | return 0; |
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125 | } |
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126 | |
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127 | public static void main(String[] args) throws Exception { |
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128 | int res = ToolRunner.run(new Configuration(), |
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129 | new ExternalMapReduce(), args); |
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130 | System.exit(res); |
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131 | } |
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132 | } |
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