| /** |
| * 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.apex.examples.mroperator; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| import java.util.StringTokenizer; |
| |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.LongWritable; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapred.FileInputFormat; |
| import org.apache.hadoop.mapred.FileOutputFormat; |
| import org.apache.hadoop.mapred.FileSplit; |
| import org.apache.hadoop.mapred.JobClient; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.MapReduceBase; |
| import org.apache.hadoop.mapred.Mapper; |
| import org.apache.hadoop.mapred.OutputCollector; |
| import org.apache.hadoop.mapred.Reducer; |
| import org.apache.hadoop.mapred.Reporter; |
| |
| /** |
| * <p>LineIndexer class.</p> |
| * |
| * @since 0.9.0 |
| */ |
| public class LineIndexer |
| { |
| |
| public static class LineIndexMapper extends MapReduceBase |
| implements Mapper<LongWritable, Text, Text, Text> |
| { |
| private static final Text word = new Text(); |
| private static final Text location = new Text(); |
| |
| public void map(LongWritable key, Text val, |
| OutputCollector<Text, Text> output, Reporter reporter) throws IOException |
| { |
| FileSplit fileSplit = (FileSplit)reporter.getInputSplit(); |
| String fileName = fileSplit.getPath().getName(); |
| location.set(fileName); |
| |
| String line = val.toString(); |
| StringTokenizer itr = new StringTokenizer(line.toLowerCase()); |
| while (itr.hasMoreTokens()) { |
| word.set(itr.nextToken()); |
| output.collect(word, location); |
| } |
| } |
| } |
| |
| |
| |
| public static class LineIndexReducer extends MapReduceBase |
| implements Reducer<Text, Text, Text, Text> |
| { |
| public void reduce(Text key, Iterator<Text> values, |
| OutputCollector<Text, Text> output, Reporter reporter) throws IOException |
| { |
| boolean first = true; |
| StringBuilder toReturn = new StringBuilder(); |
| while (values.hasNext()) { |
| if (!first) { |
| toReturn.append(", "); |
| } |
| first = false; |
| toReturn.append(values.next().toString()); |
| } |
| |
| output.collect(key, new Text(toReturn.toString())); |
| } |
| } |
| |
| |
| /** |
| * The actual main() method for our program; this is the |
| * "driver" for the MapReduce job. |
| */ |
| public static void main(String[] args) |
| { |
| JobClient client = new JobClient(); |
| JobConf conf = new JobConf(LineIndexer.class); |
| |
| conf.setJobName("LineIndexer"); |
| |
| conf.setOutputKeyClass(Text.class); |
| conf.setOutputValueClass(Text.class); |
| |
| FileInputFormat.addInputPath(conf, new Path("input")); |
| FileOutputFormat.setOutputPath(conf, new Path("output")); |
| |
| conf.setMapperClass(LineIndexMapper.class); |
| conf.setReducerClass(LineIndexReducer.class); |
| |
| client.setConf(conf); |
| |
| try { |
| JobClient.runJob(conf); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| } |
| } |
| } |