| /** |
| * 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 testjar; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| |
| import org.apache.hadoop.io.IntWritable; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.Mapper; |
| import org.apache.hadoop.mapred.OutputCollector; |
| import org.apache.hadoop.mapred.Reducer; |
| import org.apache.hadoop.mapred.Reporter; |
| |
| public class ExternalMapperReducer |
| implements Mapper, Reducer { |
| |
| public void configure(JobConf job) { |
| |
| } |
| |
| public void close() |
| throws IOException { |
| |
| } |
| |
| public void map(WritableComparable key, Writable value, |
| OutputCollector output, Reporter reporter) |
| throws IOException { |
| |
| if (value instanceof Text) { |
| Text text = (Text)value; |
| ExternalWritable ext = new ExternalWritable(text.toString()); |
| output.collect(ext, new IntWritable(1)); |
| } |
| } |
| |
| public void reduce(WritableComparable key, Iterator values, |
| OutputCollector output, Reporter reporter) |
| throws IOException { |
| |
| int count = 0; |
| while (values.hasNext()) { |
| count++; |
| values.next(); |
| } |
| output.collect(key, new IntWritable(count)); |
| } |
| } |