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R3704/hadoop-2.3.0-src/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/testjar/ExternalMapperReducer.java
2e9ad393f3f82.3.0_2.4.1

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ExternalMapperReducer.java
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/**
* 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<WritableComparable, Writable,
ExternalWritable, IntWritable>,
Reducer<WritableComparable, Writable,
WritableComparable, IntWritable> {
public void configure(JobConf job) {
}
public void close()
throws IOException {
}
public void map(WritableComparable key, Writable value,
OutputCollector<ExternalWritable, IntWritable> 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<Writable> values,
OutputCollector<WritableComparable, IntWritable> output,
Reporter reporter)
throws IOException {
int count = 0;
while (values.hasNext()) {
count++;
values.next();
}
output.collect(key, new IntWritable(count));
}
}
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