| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.mapred; |
| |
| import org.apache.hadoop.fs.*; |
| import org.apache.hadoop.io.*; |
| import org.apache.hadoop.mapred.lib.*; |
| import junit.framework.TestCase; |
| import java.text.NumberFormat; |
| |
| public class TestFieldSelection extends TestCase { |
| |
| private static NumberFormat idFormat = NumberFormat.getInstance(); |
| static { |
| idFormat.setMinimumIntegerDigits(4); |
| idFormat.setGroupingUsed(false); |
| } |
| |
| public void testFieldSelection() throws Exception { |
| launch(); |
| } |
| |
| public static void launch() throws Exception { |
| JobConf conf = new JobConf(TestFieldSelection.class); |
| FileSystem fs = FileSystem.get(conf); |
| int numOfInputLines = 10; |
| |
| Path OUTPUT_DIR = new Path("build/test/output_for_field_selection_test"); |
| Path INPUT_DIR = new Path("build/test/input_for_field_selection_test"); |
| String inputFile = "input.txt"; |
| fs.delete(INPUT_DIR, true); |
| fs.mkdirs(INPUT_DIR); |
| fs.delete(OUTPUT_DIR, true); |
| |
| StringBuffer inputData = new StringBuffer(); |
| StringBuffer expectedOutput = new StringBuffer(); |
| |
| FSDataOutputStream fileOut = fs.create(new Path(INPUT_DIR, inputFile)); |
| for (int i = 0; i < numOfInputLines; i++) { |
| inputData.append(idFormat.format(i)); |
| inputData.append("-").append(idFormat.format(i+1)); |
| inputData.append("-").append(idFormat.format(i+2)); |
| inputData.append("-").append(idFormat.format(i+3)); |
| inputData.append("-").append(idFormat.format(i+4)); |
| inputData.append("-").append(idFormat.format(i+5)); |
| inputData.append("-").append(idFormat.format(i+6)); |
| inputData.append("\n"); |
| |
| |
| expectedOutput.append(idFormat.format(i+3)); |
| expectedOutput.append("-" ).append (idFormat.format(i+2)); |
| expectedOutput.append("-" ).append (idFormat.format(i+1)); |
| expectedOutput.append("-" ).append (idFormat.format(i+5)); |
| expectedOutput.append("-" ).append (idFormat.format(i+6)); |
| |
| expectedOutput.append("-" ).append (idFormat.format(i+6)); |
| expectedOutput.append("-" ).append (idFormat.format(i+5)); |
| expectedOutput.append("-" ).append (idFormat.format(i+1)); |
| expectedOutput.append("-" ).append (idFormat.format(i+2)); |
| expectedOutput.append("-" ).append (idFormat.format(i+3)); |
| |
| expectedOutput.append("-" ).append (idFormat.format(i+0)); |
| expectedOutput.append("-" ).append (idFormat.format(i+1)); |
| expectedOutput.append("-" ).append (idFormat.format(i+2)); |
| expectedOutput.append("-" ).append (idFormat.format(i+3)); |
| expectedOutput.append("-" ).append (idFormat.format(i+4)); |
| expectedOutput.append("-" ).append (idFormat.format(i+5)); |
| expectedOutput.append("-" ).append (idFormat.format(i+6)); |
| expectedOutput.append("\n"); |
| } |
| fileOut.write(inputData.toString().getBytes("utf-8")); |
| fileOut.close(); |
| |
| System.out.println("inputData:"); |
| System.out.println(inputData.toString()); |
| JobConf job = new JobConf(conf, TestFieldSelection.class); |
| FileInputFormat.setInputPaths(job, INPUT_DIR); |
| job.setInputFormat(TextInputFormat.class); |
| job.setMapperClass(FieldSelectionMapReduce.class); |
| job.setReducerClass(FieldSelectionMapReduce.class); |
| |
| FileOutputFormat.setOutputPath(job, OUTPUT_DIR); |
| job.setOutputKeyClass(Text.class); |
| job.setOutputValueClass(Text.class); |
| job.setOutputFormat(TextOutputFormat.class); |
| job.setNumReduceTasks(1); |
| |
| job.set("mapred.data.field.separator", "-"); |
| job.set("map.output.key.value.fields.spec", "6,5,1-3:0-"); |
| job.set("reduce.output.key.value.fields.spec", ":4,3,2,1,0,0-"); |
| |
| JobClient.runJob(job); |
| |
| // |
| // Finally, we compare the reconstructed answer key with the |
| // original one. Remember, we need to ignore zero-count items |
| // in the original key. |
| // |
| boolean success = true; |
| Path outPath = new Path(OUTPUT_DIR, "part-00000"); |
| String outdata = TestMiniMRWithDFS.readOutput(outPath,job); |
| |
| assertEquals(expectedOutput.toString(),outdata); |
| fs.delete(OUTPUT_DIR, true); |
| fs.delete(INPUT_DIR, true); |
| } |
| |
| /** |
| * Launches all the tasks in order. |
| */ |
| public static void main(String[] argv) throws Exception { |
| launch(); |
| } |
| } |