SumReducer2.java

import java.io.IOException;

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

public class SumReducer2 extends Reducer
<Text, IntWritable, Text, IntWritable> {

    static enum ReducerCounters{
        REDUCER_RECORD_COUNTER
    }

    public void reduce(Text key, Iterable<IntWritable> values,
    Context context)throws IOException, InterruptedException {
        int wordCount = 0;
        int average = 0;
        System.out.println(" In Reducer now! ");
        for (IntWritable value : values) {
            wordCount += 1;
            average += value.get();
        }
        average = average/wordCount;
        context.write(key, new IntWritable(average));
        context.getCounter(SumReducer2.ReducerCounters.REDUCER_RECORD_COUNTER).increment(1);
    }

}