Data Intensive Text Processing with MapReduce #3 figure3.8 Reducer

gistfile1.java

package info.moaikids.mapred.reduce;

import java.io.IOException;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

public class Figure38Reducer extends
		Reducer<Text, IntWritable, Text, IntWritable> {

	static final int MIN = 1;
	@Override
	protected void reduce(Text key, Iterable<IntWritable> values,
			Context context) throws IOException, InterruptedException {
		int sum = 0;
		for (IntWritable value : values) {
			sum += value.get();
		}

		if (sum > MIN) {
			context.write(key, new IntWritable(sum));
		}
	}
}