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 Assignment5_P2_DistinctIPAddress; import org.apache.hadoop.io.NullWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Mapper; import java.io.IOException; /** * * @author Chintan */ public class DistinctIPAddress_Mapper extends Mapper<Object, Text, Text, NullWritable> { private Text ipaddr; public void map(Object key, Text value, Context context) throws IOException, InterruptedException { String[] ipInfo = value.toString().split("-"); ipaddr = new Text(ipInfo[0].trim()); context.write(ipaddr, NullWritable.get()); } }