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.io.Text; |
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21 | import org.apache.hadoop.mapred.JobConf; |
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22 | import org.apache.hadoop.mapred.lib.KeyFieldBasedPartitioner; |
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23 | |
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24 | import junit.framework.TestCase; |
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25 | |
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26 | public class TestKeyFieldBasedPartitioner extends TestCase { |
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27 | |
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28 | /** |
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29 | * Test is key-field-based partitioned works with empty key. |
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30 | */ |
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31 | public void testEmptyKey() throws Exception { |
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32 | int numReducers = 10; |
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33 | KeyFieldBasedPartitioner<Text, Text> kfbp = |
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34 | new KeyFieldBasedPartitioner<Text, Text>(); |
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35 | JobConf conf = new JobConf(); |
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36 | conf.setInt("num.key.fields.for.partition", 10); |
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37 | kfbp.configure(conf); |
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38 | assertEquals("Empty key should map to 0th partition", |
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39 | 0, kfbp.getPartition(new Text(), new Text(), numReducers)); |
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40 | |
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41 | // check if the hashcode is correct when no keyspec is specified |
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42 | kfbp = new KeyFieldBasedPartitioner<Text, Text>(); |
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43 | conf = new JobConf(); |
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44 | kfbp.configure(conf); |
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45 | String input = "abc\tdef\txyz"; |
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46 | int hashCode = input.hashCode(); |
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47 | int expectedPartition = kfbp.getPartition(hashCode, numReducers); |
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48 | assertEquals("Partitioner doesnt work as expected", expectedPartition, |
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49 | kfbp.getPartition(new Text(input), new Text(), numReducers)); |
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50 | |
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51 | // check if the hashcode is correct with specified keyspec |
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52 | kfbp = new KeyFieldBasedPartitioner<Text, Text>(); |
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53 | conf = new JobConf(); |
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54 | conf.set("mapred.text.key.partitioner.options", "-k2,2"); |
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55 | kfbp.configure(conf); |
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56 | String expectedOutput = "def"; |
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57 | byte[] eBytes = expectedOutput.getBytes(); |
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58 | hashCode = kfbp.hashCode(eBytes, 0, eBytes.length - 1, 0); |
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59 | expectedPartition = kfbp.getPartition(hashCode, numReducers); |
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60 | assertEquals("Partitioner doesnt work as expected", expectedPartition, |
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61 | kfbp.getPartition(new Text(input), new Text(), numReducers)); |
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62 | |
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63 | // test with invalid end index in keyspecs |
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64 | kfbp = new KeyFieldBasedPartitioner<Text, Text>(); |
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65 | conf = new JobConf(); |
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66 | conf.set("mapred.text.key.partitioner.options", "-k2,5"); |
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67 | kfbp.configure(conf); |
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68 | expectedOutput = "def\txyz"; |
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69 | eBytes = expectedOutput.getBytes(); |
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70 | hashCode = kfbp.hashCode(eBytes, 0, eBytes.length - 1, 0); |
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71 | expectedPartition = kfbp.getPartition(hashCode, numReducers); |
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72 | assertEquals("Partitioner doesnt work as expected", expectedPartition, |
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73 | kfbp.getPartition(new Text(input), new Text(), numReducers)); |
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74 | |
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75 | // test with 0 end index in keyspecs |
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76 | kfbp = new KeyFieldBasedPartitioner<Text, Text>(); |
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77 | conf = new JobConf(); |
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78 | conf.set("mapred.text.key.partitioner.options", "-k2"); |
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79 | kfbp.configure(conf); |
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80 | expectedOutput = "def\txyz"; |
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81 | eBytes = expectedOutput.getBytes(); |
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82 | hashCode = kfbp.hashCode(eBytes, 0, eBytes.length - 1, 0); |
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83 | expectedPartition = kfbp.getPartition(hashCode, numReducers); |
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84 | assertEquals("Partitioner doesnt work as expected", expectedPartition, |
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85 | kfbp.getPartition(new Text(input), new Text(), numReducers)); |
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86 | |
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87 | // test with invalid keyspecs |
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88 | kfbp = new KeyFieldBasedPartitioner<Text, Text>(); |
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89 | conf = new JobConf(); |
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90 | conf.set("mapred.text.key.partitioner.options", "-k10"); |
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91 | kfbp.configure(conf); |
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92 | assertEquals("Partitioner doesnt work as expected", 0, |
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93 | kfbp.getPartition(new Text(input), new Text(), numReducers)); |
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94 | |
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95 | // test with multiple keyspecs |
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96 | kfbp = new KeyFieldBasedPartitioner<Text, Text>(); |
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97 | conf = new JobConf(); |
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98 | conf.set("mapred.text.key.partitioner.options", "-k2,2 -k4,4"); |
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99 | kfbp.configure(conf); |
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100 | input = "abc\tdef\tpqr\txyz"; |
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101 | expectedOutput = "def"; |
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102 | eBytes = expectedOutput.getBytes(); |
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103 | hashCode = kfbp.hashCode(eBytes, 0, eBytes.length - 1, 0); |
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104 | expectedOutput = "xyz"; |
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105 | eBytes = expectedOutput.getBytes(); |
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106 | hashCode = kfbp.hashCode(eBytes, 0, eBytes.length - 1, hashCode); |
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107 | expectedPartition = kfbp.getPartition(hashCode, numReducers); |
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108 | assertEquals("Partitioner doesnt work as expected", expectedPartition, |
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109 | kfbp.getPartition(new Text(input), new Text(), numReducers)); |
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110 | |
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111 | // test with invalid start index in keyspecs |
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112 | kfbp = new KeyFieldBasedPartitioner<Text, Text>(); |
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113 | conf = new JobConf(); |
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114 | conf.set("mapred.text.key.partitioner.options", "-k2,2 -k30,21 -k4,4 -k5"); |
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115 | kfbp.configure(conf); |
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116 | expectedOutput = "def"; |
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117 | eBytes = expectedOutput.getBytes(); |
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118 | hashCode = kfbp.hashCode(eBytes, 0, eBytes.length - 1, 0); |
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119 | expectedOutput = "xyz"; |
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120 | eBytes = expectedOutput.getBytes(); |
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121 | hashCode = kfbp.hashCode(eBytes, 0, eBytes.length - 1, hashCode); |
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122 | expectedPartition = kfbp.getPartition(hashCode, numReducers); |
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123 | assertEquals("Partitioner doesnt work as expected", expectedPartition, |
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124 | kfbp.getPartition(new Text(input), new Text(), numReducers)); |
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125 | } |
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126 | } |
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