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; |
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19 | |
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20 | import java.io.BufferedReader; |
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21 | import java.io.IOException; |
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22 | import java.io.InputStream; |
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23 | import java.io.InputStreamReader; |
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24 | import java.io.OutputStream; |
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25 | import java.io.OutputStreamWriter; |
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26 | import java.io.Writer; |
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27 | import java.util.Iterator; |
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28 | import java.util.StringTokenizer; |
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29 | |
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30 | import org.apache.hadoop.fs.FileUtil; |
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31 | import org.apache.hadoop.fs.Path; |
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32 | import org.apache.hadoop.io.LongWritable; |
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33 | import org.apache.hadoop.io.Text; |
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34 | import org.apache.hadoop.io.serializer.JavaSerializationComparator; |
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35 | |
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36 | public class TestJavaSerialization extends ClusterMapReduceTestCase { |
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37 | |
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38 | static class WordCountMapper extends MapReduceBase implements |
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39 | Mapper<LongWritable, Text, String, Long> { |
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40 | |
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41 | public void map(LongWritable key, Text value, |
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42 | OutputCollector<String, Long> output, Reporter reporter) |
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43 | throws IOException { |
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44 | StringTokenizer st = new StringTokenizer(value.toString()); |
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45 | while (st.hasMoreTokens()) { |
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46 | output.collect(st.nextToken(), 1L); |
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47 | } |
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48 | } |
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49 | |
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50 | } |
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51 | |
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52 | static class SumReducer<K> extends MapReduceBase implements |
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53 | Reducer<K, Long, K, Long> { |
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54 | |
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55 | public void reduce(K key, Iterator<Long> values, |
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56 | OutputCollector<K, Long> output, Reporter reporter) |
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57 | throws IOException { |
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58 | |
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59 | long sum = 0; |
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60 | while (values.hasNext()) { |
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61 | sum += values.next(); |
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62 | } |
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63 | output.collect(key, sum); |
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64 | } |
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65 | |
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66 | } |
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67 | |
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68 | public void testMapReduceJob() throws Exception { |
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69 | OutputStream os = getFileSystem().create(new Path(getInputDir(), |
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70 | "text.txt")); |
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71 | Writer wr = new OutputStreamWriter(os); |
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72 | wr.write("b a\n"); |
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73 | wr.close(); |
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74 | |
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75 | JobConf conf = createJobConf(); |
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76 | conf.setJobName("JavaSerialization"); |
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77 | |
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78 | conf.set("io.serializations", |
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79 | "org.apache.hadoop.io.serializer.JavaSerialization," + |
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80 | "org.apache.hadoop.io.serializer.WritableSerialization"); |
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81 | |
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82 | conf.setInputFormat(TextInputFormat.class); |
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83 | |
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84 | conf.setOutputKeyClass(String.class); |
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85 | conf.setOutputValueClass(Long.class); |
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86 | conf.setOutputKeyComparatorClass(JavaSerializationComparator.class); |
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87 | |
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88 | conf.setMapperClass(WordCountMapper.class); |
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89 | conf.setReducerClass(SumReducer.class); |
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90 | |
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91 | FileInputFormat.setInputPaths(conf, getInputDir()); |
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92 | |
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93 | FileOutputFormat.setOutputPath(conf, getOutputDir()); |
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94 | |
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95 | JobClient.runJob(conf); |
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96 | |
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97 | Path[] outputFiles = FileUtil.stat2Paths( |
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98 | getFileSystem().listStatus(getOutputDir(), |
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99 | new OutputLogFilter())); |
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100 | assertEquals(1, outputFiles.length); |
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101 | InputStream is = getFileSystem().open(outputFiles[0]); |
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102 | BufferedReader reader = new BufferedReader(new InputStreamReader(is)); |
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103 | assertEquals("a\t1", reader.readLine()); |
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104 | assertEquals("b\t1", reader.readLine()); |
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105 | assertNull(reader.readLine()); |
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106 | reader.close(); |
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107 | } |
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108 | |
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109 | /** |
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110 | * HADOOP-4466: |
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111 | * This test verifies the JavSerialization impl can write to SequenceFiles. by virtue other |
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112 | * SequenceFileOutputFormat is not coupled to Writable types, if so, the job will fail. |
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113 | * |
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114 | */ |
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115 | public void testWriteToSequencefile() throws Exception { |
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116 | OutputStream os = getFileSystem().create(new Path(getInputDir(), |
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117 | "text.txt")); |
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118 | Writer wr = new OutputStreamWriter(os); |
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119 | wr.write("b a\n"); |
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120 | wr.close(); |
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121 | |
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122 | JobConf conf = createJobConf(); |
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123 | conf.setJobName("JavaSerialization"); |
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124 | |
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125 | conf.set("io.serializations", |
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126 | "org.apache.hadoop.io.serializer.JavaSerialization," + |
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127 | "org.apache.hadoop.io.serializer.WritableSerialization"); |
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128 | |
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129 | conf.setInputFormat(TextInputFormat.class); |
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130 | conf.setOutputFormat(SequenceFileOutputFormat.class); // test we can write to sequence files |
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131 | |
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132 | conf.setOutputKeyClass(String.class); |
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133 | conf.setOutputValueClass(Long.class); |
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134 | conf.setOutputKeyComparatorClass(JavaSerializationComparator.class); |
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135 | |
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136 | conf.setMapperClass(WordCountMapper.class); |
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137 | conf.setReducerClass(SumReducer.class); |
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138 | |
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139 | FileInputFormat.setInputPaths(conf, getInputDir()); |
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140 | |
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141 | FileOutputFormat.setOutputPath(conf, getOutputDir()); |
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142 | |
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143 | JobClient.runJob(conf); |
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144 | |
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145 | Path[] outputFiles = FileUtil.stat2Paths( |
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146 | getFileSystem().listStatus(getOutputDir(), |
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147 | new OutputLogFilter())); |
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148 | assertEquals(1, outputFiles.length); |
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149 | } |
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150 | |
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151 | } |
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