Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package Analysis.A4_High_Traffic_Countries; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Reducer; import java.io.IOException; import java.util.Collections; import java.util.Map; import java.util.TreeMap; /** * * @author Chintan */ public class Top_10_Countries_by_User_Traffic_Combiner extends Reducer<Text, IntWritable, Text, IntWritable> { public IntWritable total = new IntWritable(); public void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException { int count = 0; for (IntWritable value : values) { count += value.get(); } total.set(count); context.write(key, total); } }