[120] | 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 org.apache.hadoop.fs.*; |
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| 21 | import org.apache.hadoop.io.*; |
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| 22 | import org.apache.hadoop.mapred.lib.*; |
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| 23 | import junit.framework.TestCase; |
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| 24 | import java.text.NumberFormat; |
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| 25 | |
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| 26 | public class TestFieldSelection extends TestCase { |
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| 27 | |
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| 28 | private static NumberFormat idFormat = NumberFormat.getInstance(); |
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| 29 | static { |
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| 30 | idFormat.setMinimumIntegerDigits(4); |
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| 31 | idFormat.setGroupingUsed(false); |
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| 32 | } |
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| 33 | |
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| 34 | public void testFieldSelection() throws Exception { |
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| 35 | launch(); |
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| 36 | } |
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| 37 | |
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| 38 | public static void launch() throws Exception { |
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| 39 | JobConf conf = new JobConf(TestFieldSelection.class); |
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| 40 | FileSystem fs = FileSystem.get(conf); |
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| 41 | int numOfInputLines = 10; |
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| 42 | |
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| 43 | Path OUTPUT_DIR = new Path("build/test/output_for_field_selection_test"); |
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| 44 | Path INPUT_DIR = new Path("build/test/input_for_field_selection_test"); |
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| 45 | String inputFile = "input.txt"; |
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| 46 | fs.delete(INPUT_DIR, true); |
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| 47 | fs.mkdirs(INPUT_DIR); |
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| 48 | fs.delete(OUTPUT_DIR, true); |
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| 49 | |
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| 50 | StringBuffer inputData = new StringBuffer(); |
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| 51 | StringBuffer expectedOutput = new StringBuffer(); |
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| 52 | |
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| 53 | FSDataOutputStream fileOut = fs.create(new Path(INPUT_DIR, inputFile)); |
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| 54 | for (int i = 0; i < numOfInputLines; i++) { |
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| 55 | inputData.append(idFormat.format(i)); |
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| 56 | inputData.append("-").append(idFormat.format(i+1)); |
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| 57 | inputData.append("-").append(idFormat.format(i+2)); |
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| 58 | inputData.append("-").append(idFormat.format(i+3)); |
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| 59 | inputData.append("-").append(idFormat.format(i+4)); |
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| 60 | inputData.append("-").append(idFormat.format(i+5)); |
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| 61 | inputData.append("-").append(idFormat.format(i+6)); |
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| 62 | inputData.append("\n"); |
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| 63 | |
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| 64 | |
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| 65 | expectedOutput.append(idFormat.format(i+3)); |
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| 66 | expectedOutput.append("-" ).append (idFormat.format(i+2)); |
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| 67 | expectedOutput.append("-" ).append (idFormat.format(i+1)); |
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| 68 | expectedOutput.append("-" ).append (idFormat.format(i+5)); |
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| 69 | expectedOutput.append("-" ).append (idFormat.format(i+6)); |
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| 70 | |
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| 71 | expectedOutput.append("-" ).append (idFormat.format(i+6)); |
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| 72 | expectedOutput.append("-" ).append (idFormat.format(i+5)); |
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| 73 | expectedOutput.append("-" ).append (idFormat.format(i+1)); |
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| 74 | expectedOutput.append("-" ).append (idFormat.format(i+2)); |
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| 75 | expectedOutput.append("-" ).append (idFormat.format(i+3)); |
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| 76 | |
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| 77 | expectedOutput.append("-" ).append (idFormat.format(i+0)); |
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| 78 | expectedOutput.append("-" ).append (idFormat.format(i+1)); |
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| 79 | expectedOutput.append("-" ).append (idFormat.format(i+2)); |
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| 80 | expectedOutput.append("-" ).append (idFormat.format(i+3)); |
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| 81 | expectedOutput.append("-" ).append (idFormat.format(i+4)); |
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| 82 | expectedOutput.append("-" ).append (idFormat.format(i+5)); |
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| 83 | expectedOutput.append("-" ).append (idFormat.format(i+6)); |
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| 84 | expectedOutput.append("\n"); |
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| 85 | } |
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| 86 | fileOut.write(inputData.toString().getBytes("utf-8")); |
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| 87 | fileOut.close(); |
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| 88 | |
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| 89 | System.out.println("inputData:"); |
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| 90 | System.out.println(inputData.toString()); |
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| 91 | JobConf job = new JobConf(conf, TestFieldSelection.class); |
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| 92 | FileInputFormat.setInputPaths(job, INPUT_DIR); |
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| 93 | job.setInputFormat(TextInputFormat.class); |
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| 94 | job.setMapperClass(FieldSelectionMapReduce.class); |
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| 95 | job.setReducerClass(FieldSelectionMapReduce.class); |
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| 96 | |
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| 97 | FileOutputFormat.setOutputPath(job, OUTPUT_DIR); |
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| 98 | job.setOutputKeyClass(Text.class); |
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| 99 | job.setOutputValueClass(Text.class); |
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| 100 | job.setOutputFormat(TextOutputFormat.class); |
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| 101 | job.setNumReduceTasks(1); |
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| 102 | |
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| 103 | job.set("mapred.data.field.separator", "-"); |
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| 104 | job.set("map.output.key.value.fields.spec", "6,5,1-3:0-"); |
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| 105 | job.set("reduce.output.key.value.fields.spec", ":4,3,2,1,0,0-"); |
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| 106 | |
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| 107 | JobClient.runJob(job); |
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| 108 | |
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| 109 | // |
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| 110 | // Finally, we compare the reconstructed answer key with the |
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| 111 | // original one. Remember, we need to ignore zero-count items |
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| 112 | // in the original key. |
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| 113 | // |
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| 114 | boolean success = true; |
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| 115 | Path outPath = new Path(OUTPUT_DIR, "part-00000"); |
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| 116 | String outdata = TestMiniMRWithDFS.readOutput(outPath,job); |
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| 117 | |
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| 118 | assertEquals(expectedOutput.toString(),outdata); |
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| 119 | fs.delete(OUTPUT_DIR, true); |
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| 120 | fs.delete(INPUT_DIR, true); |
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| 121 | } |
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| 122 | |
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| 123 | /** |
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| 124 | * Launches all the tasks in order. |
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| 125 | */ |
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| 126 | public static void main(String[] argv) throws Exception { |
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| 127 | launch(); |
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| 128 | } |
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| 129 | } |
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