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.mapreduce; |
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20 | |
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21 | import java.io.BufferedReader; |
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22 | import java.io.DataInputStream; |
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23 | import java.io.DataOutputStream; |
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24 | import java.io.IOException; |
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25 | import java.io.InputStreamReader; |
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26 | |
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27 | import junit.framework.TestCase; |
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28 | |
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29 | import org.apache.hadoop.conf.Configuration; |
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30 | import org.apache.hadoop.examples.WordCount; |
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31 | import org.apache.hadoop.examples.WordCount.IntSumReducer; |
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32 | import org.apache.hadoop.examples.WordCount.TokenizerMapper; |
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33 | import org.apache.hadoop.fs.FileSystem; |
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34 | import org.apache.hadoop.fs.Path; |
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35 | import org.apache.hadoop.io.IntWritable; |
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36 | import org.apache.hadoop.io.LongWritable; |
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37 | import org.apache.hadoop.io.Text; |
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38 | import org.apache.hadoop.mapred.MiniMRCluster; |
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39 | import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; |
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40 | import org.apache.hadoop.mapreduce.lib.input.LineRecordReader; |
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41 | import org.apache.hadoop.mapreduce.lib.input.TextInputFormat; |
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42 | import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; |
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43 | |
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44 | /** |
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45 | * A JUnit test to test min map-reduce cluster with local file system. |
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46 | */ |
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47 | public class TestMapReduceLocal extends TestCase { |
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48 | private static Path TEST_ROOT_DIR = |
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49 | new Path(System.getProperty("test.build.data","/tmp")); |
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50 | private static Configuration conf = new Configuration(); |
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51 | private static FileSystem localFs; |
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52 | static { |
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53 | try { |
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54 | localFs = FileSystem.getLocal(conf); |
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55 | } catch (IOException io) { |
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56 | throw new RuntimeException("problem getting local fs", io); |
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57 | } |
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58 | } |
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59 | |
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60 | public static Path writeFile(String name, String data) throws IOException { |
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61 | Path file = new Path(TEST_ROOT_DIR + "/" + name); |
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62 | localFs.delete(file, false); |
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63 | DataOutputStream f = localFs.create(file); |
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64 | f.write(data.getBytes()); |
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65 | f.close(); |
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66 | return file; |
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67 | } |
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68 | |
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69 | public static String readFile(String name) throws IOException { |
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70 | DataInputStream f = localFs.open(new Path(TEST_ROOT_DIR + "/" + name)); |
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71 | BufferedReader b = new BufferedReader(new InputStreamReader(f)); |
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72 | StringBuilder result = new StringBuilder(); |
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73 | String line = b.readLine(); |
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74 | while (line != null) { |
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75 | result.append(line); |
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76 | result.append('\n'); |
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77 | line = b.readLine(); |
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78 | } |
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79 | b.close(); |
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80 | return result.toString(); |
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81 | } |
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82 | |
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83 | public void testWithLocal() throws Exception { |
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84 | MiniMRCluster mr = null; |
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85 | try { |
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86 | mr = new MiniMRCluster(2, "file:///", 3); |
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87 | Configuration conf = mr.createJobConf(); |
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88 | runWordCount(conf); |
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89 | } finally { |
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90 | if (mr != null) { mr.shutdown(); } |
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91 | } |
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92 | } |
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93 | |
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94 | public static class TrackingTextInputFormat extends TextInputFormat { |
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95 | |
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96 | public static class MonoProgressRecordReader extends LineRecordReader { |
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97 | private float last = 0.0f; |
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98 | private boolean progressCalled = false; |
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99 | @Override |
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100 | public float getProgress() { |
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101 | progressCalled = true; |
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102 | final float ret = super.getProgress(); |
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103 | assertTrue("getProgress decreased", ret >= last); |
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104 | last = ret; |
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105 | return ret; |
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106 | } |
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107 | @Override |
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108 | public synchronized void close() throws IOException { |
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109 | assertTrue("getProgress never called", progressCalled); |
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110 | super.close(); |
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111 | } |
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112 | } |
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113 | |
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114 | @Override |
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115 | public RecordReader<LongWritable, Text> createRecordReader( |
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116 | InputSplit split, TaskAttemptContext context) { |
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117 | return new MonoProgressRecordReader(); |
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118 | } |
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119 | } |
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120 | |
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121 | private void runWordCount(Configuration conf |
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122 | ) throws IOException, |
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123 | InterruptedException, |
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124 | ClassNotFoundException { |
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125 | final String COUNTER_GROUP = "org.apache.hadoop.mapred.Task$Counter"; |
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126 | localFs.delete(new Path(TEST_ROOT_DIR + "/in"), true); |
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127 | localFs.delete(new Path(TEST_ROOT_DIR + "/out"), true); |
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128 | writeFile("in/part1", "this is a test\nof word count test\ntest\n"); |
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129 | writeFile("in/part2", "more test"); |
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130 | Job job = new Job(conf, "word count"); |
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131 | job.setJarByClass(WordCount.class); |
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132 | job.setMapperClass(TokenizerMapper.class); |
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133 | job.setCombinerClass(IntSumReducer.class); |
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134 | job.setReducerClass(IntSumReducer.class); |
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135 | job.setOutputKeyClass(Text.class); |
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136 | job.setOutputValueClass(IntWritable.class); |
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137 | job.setInputFormatClass(TrackingTextInputFormat.class); |
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138 | FileInputFormat.addInputPath(job, new Path(TEST_ROOT_DIR + "/in")); |
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139 | FileOutputFormat.setOutputPath(job, new Path(TEST_ROOT_DIR + "/out")); |
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140 | assertTrue(job.waitForCompletion(false)); |
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141 | String out = readFile("out/part-r-00000"); |
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142 | System.out.println(out); |
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143 | assertEquals("a\t1\ncount\t1\nis\t1\nmore\t1\nof\t1\ntest\t4\nthis\t1\nword\t1\n", |
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144 | out); |
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145 | Counters ctrs = job.getCounters(); |
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146 | System.out.println("Counters: " + ctrs); |
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147 | long combineIn = ctrs.findCounter(COUNTER_GROUP, |
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148 | "COMBINE_INPUT_RECORDS").getValue(); |
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149 | long combineOut = ctrs.findCounter(COUNTER_GROUP, |
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150 | "COMBINE_OUTPUT_RECORDS").getValue(); |
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151 | long reduceIn = ctrs.findCounter(COUNTER_GROUP, |
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152 | "REDUCE_INPUT_RECORDS").getValue(); |
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153 | long mapOut = ctrs.findCounter(COUNTER_GROUP, |
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154 | "MAP_OUTPUT_RECORDS").getValue(); |
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155 | assertEquals("map out = combine in", mapOut, combineIn); |
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156 | assertEquals("combine out = reduce in", combineOut, reduceIn); |
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157 | assertTrue("combine in > combine out", combineIn > combineOut); |
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158 | String group = "Random Group"; |
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159 | CounterGroup ctrGrp = ctrs.getGroup(group); |
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160 | assertEquals(0, ctrGrp.size()); |
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161 | } |
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162 | |
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163 | } |
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