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.lib; |
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19 | |
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20 | import org.apache.hadoop.fs.FileStatus; |
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21 | import org.apache.hadoop.fs.FileSystem; |
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22 | import org.apache.hadoop.fs.Path; |
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23 | import org.apache.hadoop.io.LongWritable; |
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24 | import org.apache.hadoop.io.SequenceFile; |
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25 | import org.apache.hadoop.io.Text; |
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26 | import org.apache.hadoop.mapred.*; |
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27 | |
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28 | import java.io.BufferedReader; |
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29 | import java.io.DataOutputStream; |
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30 | import java.io.IOException; |
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31 | import java.io.InputStreamReader; |
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32 | import java.util.Iterator; |
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33 | |
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34 | public class TestMultipleOutputs extends HadoopTestCase { |
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35 | |
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36 | public TestMultipleOutputs() throws IOException { |
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37 | super(HadoopTestCase.LOCAL_MR, HadoopTestCase.LOCAL_FS, 1, 1); |
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38 | } |
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39 | |
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40 | public void testWithoutCounters() throws Exception { |
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41 | _testMultipleOutputs(false); |
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42 | } |
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43 | |
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44 | public void testWithCounters() throws Exception { |
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45 | _testMultipleOutputs(true); |
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46 | } |
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47 | |
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48 | private static final Path ROOT_DIR = new Path("testing/mo"); |
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49 | private static final Path IN_DIR = new Path(ROOT_DIR, "input"); |
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50 | private static final Path OUT_DIR = new Path(ROOT_DIR, "output"); |
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51 | |
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52 | private Path getDir(Path dir) { |
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53 | // Hack for local FS that does not have the concept of a 'mounting point' |
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54 | if (isLocalFS()) { |
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55 | String localPathRoot = System.getProperty("test.build.data", "/tmp") |
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56 | .replace(' ', '+'); |
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57 | dir = new Path(localPathRoot, dir); |
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58 | } |
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59 | return dir; |
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60 | } |
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61 | |
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62 | public void setUp() throws Exception { |
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63 | super.setUp(); |
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64 | Path rootDir = getDir(ROOT_DIR); |
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65 | Path inDir = getDir(IN_DIR); |
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66 | |
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67 | JobConf conf = createJobConf(); |
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68 | FileSystem fs = FileSystem.get(conf); |
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69 | fs.delete(rootDir, true); |
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70 | if (!fs.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 | |
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75 | public void tearDown() throws Exception { |
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76 | Path rootDir = getDir(ROOT_DIR); |
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77 | |
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78 | JobConf conf = createJobConf(); |
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79 | FileSystem fs = FileSystem.get(conf); |
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80 | fs.delete(rootDir, true); |
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81 | super.tearDown(); |
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82 | } |
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83 | |
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84 | protected void _testMultipleOutputs(boolean withCounters) throws Exception { |
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85 | Path inDir = getDir(IN_DIR); |
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86 | Path outDir = getDir(OUT_DIR); |
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87 | |
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88 | JobConf conf = createJobConf(); |
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89 | FileSystem fs = FileSystem.get(conf); |
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90 | |
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91 | DataOutputStream file = fs.create(new Path(inDir, "part-0")); |
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92 | file.writeBytes("a\nb\n\nc\nd\ne"); |
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93 | file.close(); |
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94 | |
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95 | file = fs.create(new Path(inDir, "part-1")); |
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96 | file.writeBytes("a\nb\n\nc\nd\ne"); |
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97 | file.close(); |
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98 | |
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99 | conf.setJobName("mo"); |
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100 | conf.setInputFormat(TextInputFormat.class); |
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101 | |
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102 | conf.setOutputKeyClass(LongWritable.class); |
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103 | conf.setOutputValueClass(Text.class); |
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104 | |
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105 | conf.setMapOutputKeyClass(LongWritable.class); |
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106 | conf.setMapOutputValueClass(Text.class); |
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107 | |
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108 | conf.setOutputFormat(TextOutputFormat.class); |
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109 | conf.setOutputKeyClass(LongWritable.class); |
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110 | conf.setOutputValueClass(Text.class); |
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111 | |
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112 | MultipleOutputs.addNamedOutput(conf, "text", TextOutputFormat.class, |
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113 | LongWritable.class, Text.class); |
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114 | MultipleOutputs.addMultiNamedOutput(conf, "sequence", |
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115 | SequenceFileOutputFormat.class, LongWritable.class, Text.class); |
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116 | |
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117 | MultipleOutputs.setCountersEnabled(conf, withCounters); |
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118 | |
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119 | conf.setMapperClass(MOMap.class); |
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120 | conf.setReducerClass(MOReduce.class); |
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121 | |
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122 | FileInputFormat.setInputPaths(conf, inDir); |
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123 | FileOutputFormat.setOutputPath(conf, outDir); |
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124 | |
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125 | JobClient jc = new JobClient(conf); |
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126 | RunningJob job = jc.submitJob(conf); |
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127 | while (!job.isComplete()) { |
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128 | Thread.sleep(100); |
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129 | } |
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130 | |
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131 | // assert number of named output part files |
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132 | int namedOutputCount = 0; |
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133 | FileStatus[] statuses = fs.listStatus(outDir); |
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134 | for (FileStatus status : statuses) { |
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135 | if (status.getPath().getName().equals("text-m-00000") || |
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136 | status.getPath().getName().equals("text-m-00001") || |
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137 | status.getPath().getName().equals("text-r-00000") || |
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138 | status.getPath().getName().equals("sequence_A-m-00000") || |
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139 | status.getPath().getName().equals("sequence_A-m-00001") || |
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140 | status.getPath().getName().equals("sequence_B-m-00000") || |
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141 | status.getPath().getName().equals("sequence_B-m-00001") || |
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142 | status.getPath().getName().equals("sequence_B-r-00000") || |
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143 | status.getPath().getName().equals("sequence_C-r-00000")) { |
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144 | namedOutputCount++; |
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145 | } |
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146 | } |
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147 | assertEquals(9, namedOutputCount); |
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148 | |
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149 | // assert TextOutputFormat files correctness |
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150 | BufferedReader reader = new BufferedReader( |
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151 | new InputStreamReader(fs.open( |
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152 | new Path(FileOutputFormat.getOutputPath(conf), "text-r-00000")))); |
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153 | int count = 0; |
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154 | String line = reader.readLine(); |
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155 | while (line != null) { |
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156 | assertTrue(line.endsWith("text")); |
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157 | line = reader.readLine(); |
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158 | count++; |
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159 | } |
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160 | reader.close(); |
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161 | assertFalse(count == 0); |
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162 | |
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163 | // assert SequenceOutputFormat files correctness |
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164 | SequenceFile.Reader seqReader = |
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165 | new SequenceFile.Reader(fs, new Path(FileOutputFormat.getOutputPath(conf), |
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166 | "sequence_B-r-00000"), conf); |
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167 | |
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168 | assertEquals(LongWritable.class, seqReader.getKeyClass()); |
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169 | assertEquals(Text.class, seqReader.getValueClass()); |
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170 | |
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171 | count = 0; |
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172 | LongWritable key = new LongWritable(); |
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173 | Text value = new Text(); |
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174 | while (seqReader.next(key, value)) { |
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175 | assertEquals("sequence", value.toString()); |
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176 | count++; |
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177 | } |
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178 | seqReader.close(); |
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179 | assertFalse(count == 0); |
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180 | |
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181 | Counters.Group counters = |
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182 | job.getCounters().getGroup(MultipleOutputs.class.getName()); |
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183 | if (!withCounters) { |
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184 | assertEquals(0, counters.size()); |
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185 | } |
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186 | else { |
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187 | assertEquals(4, counters.size()); |
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188 | assertEquals(4, counters.getCounter("text")); |
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189 | assertEquals(2, counters.getCounter("sequence_A")); |
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190 | assertEquals(4, counters.getCounter("sequence_B")); |
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191 | assertEquals(2, counters.getCounter("sequence_C")); |
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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 | |
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197 | @SuppressWarnings({"unchecked"}) |
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198 | public static class MOMap implements Mapper<LongWritable, Text, LongWritable, |
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199 | Text> { |
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200 | |
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201 | private MultipleOutputs mos; |
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202 | |
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203 | public void configure(JobConf conf) { |
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204 | mos = new MultipleOutputs(conf); |
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205 | } |
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206 | |
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207 | public void map(LongWritable key, Text value, |
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208 | OutputCollector<LongWritable, Text> output, |
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209 | Reporter reporter) |
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210 | throws IOException { |
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211 | if (!value.toString().equals("a")) { |
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212 | output.collect(key, value); |
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213 | } else { |
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214 | mos.getCollector("text", reporter).collect(key, new Text("text")); |
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215 | mos.getCollector("sequence", "A", reporter).collect(key, |
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216 | new Text("sequence")); |
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217 | mos.getCollector("sequence", "B", reporter).collect(key, |
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218 | new Text("sequence")); |
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219 | } |
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220 | } |
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221 | |
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222 | public void close() throws IOException { |
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223 | mos.close(); |
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224 | } |
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225 | } |
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226 | |
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227 | @SuppressWarnings({"unchecked"}) |
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228 | public static class MOReduce implements Reducer<LongWritable, Text, |
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229 | LongWritable, Text> { |
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230 | |
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231 | private MultipleOutputs mos; |
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232 | |
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233 | public void configure(JobConf conf) { |
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234 | mos = new MultipleOutputs(conf); |
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235 | } |
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236 | |
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237 | public void reduce(LongWritable key, Iterator<Text> values, |
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238 | OutputCollector<LongWritable, Text> output, |
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239 | Reporter reporter) |
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240 | throws IOException { |
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241 | while (values.hasNext()) { |
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242 | Text value = values.next(); |
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243 | if (!value.toString().equals("b")) { |
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244 | output.collect(key, value); |
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245 | } else { |
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246 | mos.getCollector("text", reporter).collect(key, new Text("text")); |
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247 | mos.getCollector("sequence", "B", reporter).collect(key, |
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248 | new Text("sequence")); |
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249 | mos.getCollector("sequence", "C", reporter).collect(key, |
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250 | new Text("sequence")); |
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251 | } |
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252 | } |
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253 | } |
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254 | |
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255 | public void close() throws IOException { |
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256 | mos.close(); |
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257 | } |
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258 | } |
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259 | |
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260 | } |
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