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.IOException; |
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21 | |
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22 | import junit.framework.TestCase; |
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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.fs.FileSystem; |
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26 | import org.apache.hadoop.fs.LocalFileSystem; |
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27 | import org.apache.hadoop.fs.Path; |
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28 | import org.apache.hadoop.io.Text; |
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29 | import org.apache.hadoop.io.WritableComparator; |
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30 | import org.apache.hadoop.io.compress.CompressionCodec; |
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31 | import org.apache.hadoop.io.compress.DefaultCodec; |
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32 | import org.apache.hadoop.util.Progressable; |
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33 | |
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34 | /** |
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35 | * This test exercises the ValueIterator. |
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36 | */ |
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37 | public class TestReduceTask extends TestCase { |
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38 | |
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39 | static class NullProgress implements Progressable { |
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40 | public void progress() { } |
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41 | } |
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42 | |
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43 | private static class Pair { |
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44 | String key; |
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45 | String value; |
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46 | Pair(String k, String v) { |
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47 | key = k; |
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48 | value = v; |
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49 | } |
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50 | } |
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51 | private static Pair[][] testCases = |
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52 | new Pair[][]{ |
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53 | new Pair[]{ |
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54 | new Pair("k1", "v1"), |
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55 | new Pair("k2", "v2"), |
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56 | new Pair("k3", "v3"), |
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57 | new Pair("k3", "v4"), |
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58 | new Pair("k4", "v5"), |
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59 | new Pair("k5", "v6"), |
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60 | }, |
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61 | new Pair[]{ |
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62 | new Pair("", "v1"), |
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63 | new Pair("k1", "v2"), |
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64 | new Pair("k2", "v3"), |
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65 | new Pair("k2", "v4"), |
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66 | }, |
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67 | new Pair[] {}, |
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68 | new Pair[]{ |
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69 | new Pair("k1", "v1"), |
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70 | new Pair("k1", "v2"), |
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71 | new Pair("k1", "v3"), |
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72 | new Pair("k1", "v4"), |
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73 | } |
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74 | }; |
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75 | |
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76 | public void runValueIterator(Path tmpDir, Pair[] vals, |
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77 | Configuration conf, |
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78 | CompressionCodec codec) throws IOException { |
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79 | FileSystem localFs = FileSystem.getLocal(conf); |
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80 | FileSystem rfs = ((LocalFileSystem)localFs).getRaw(); |
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81 | Path path = new Path(tmpDir, "data.in"); |
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82 | IFile.Writer<Text, Text> writer = |
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83 | new IFile.Writer<Text, Text>(conf, rfs, path, Text.class, Text.class, |
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84 | codec, null); |
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85 | for(Pair p: vals) { |
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86 | writer.append(new Text(p.key), new Text(p.value)); |
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87 | } |
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88 | writer.close(); |
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89 | |
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90 | @SuppressWarnings("unchecked") |
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91 | RawKeyValueIterator rawItr = |
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92 | Merger.merge(conf, rfs, Text.class, Text.class, codec, new Path[]{path}, |
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93 | false, conf.getInt("io.sort.factor", 100), tmpDir, |
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94 | new Text.Comparator(), new NullProgress(),null,null); |
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95 | @SuppressWarnings("unchecked") // WritableComparators are not generic |
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96 | ReduceTask.ValuesIterator valItr = |
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97 | new ReduceTask.ValuesIterator<Text,Text>(rawItr, |
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98 | WritableComparator.get(Text.class), Text.class, Text.class, |
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99 | conf, new NullProgress()); |
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100 | int i = 0; |
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101 | while (valItr.more()) { |
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102 | Object key = valItr.getKey(); |
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103 | String keyString = key.toString(); |
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104 | // make sure it matches! |
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105 | assertEquals(vals[i].key, keyString); |
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106 | // must have at least 1 value! |
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107 | assertTrue(valItr.hasNext()); |
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108 | while (valItr.hasNext()) { |
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109 | String valueString = valItr.next().toString(); |
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110 | // make sure the values match |
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111 | assertEquals(vals[i].value, valueString); |
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112 | // make sure the keys match |
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113 | assertEquals(vals[i].key, valItr.getKey().toString()); |
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114 | i += 1; |
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115 | } |
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116 | // make sure the key hasn't changed under the hood |
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117 | assertEquals(keyString, valItr.getKey().toString()); |
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118 | valItr.nextKey(); |
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119 | } |
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120 | assertEquals(vals.length, i); |
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121 | // make sure we have progress equal to 1.0 |
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122 | assertEquals(1.0f, rawItr.getProgress().get()); |
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123 | } |
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124 | |
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125 | public void testValueIterator() throws Exception { |
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126 | Path tmpDir = new Path("build/test/test.reduce.task"); |
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127 | Configuration conf = new Configuration(); |
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128 | for (Pair[] testCase: testCases) { |
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129 | runValueIterator(tmpDir, testCase, conf, null); |
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130 | } |
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131 | } |
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132 | |
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133 | public void testValueIteratorWithCompression() throws Exception { |
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134 | Path tmpDir = new Path("build/test/test.reduce.task.compression"); |
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135 | Configuration conf = new Configuration(); |
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136 | DefaultCodec codec = new DefaultCodec(); |
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137 | codec.setConf(conf); |
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138 | for (Pair[] testCase: testCases) { |
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139 | runValueIterator(tmpDir, testCase, conf, codec); |
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140 | } |
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141 | } |
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142 | } |
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