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.A3_Total_Users_By_Gender; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Mapper; import java.io.IOException; /** * * @author Chintan */ public class User_Gender_Count_Mapper extends Mapper<Object, Text, Text, IntWritable> { private Text gender; private IntWritable one = new IntWritable(1); public void map(Object key, Text value, Context context) throws IOException, InterruptedException { // get user info String[] userInfo = value.toString().split("\t"); String userGender = userInfo[1]; // extract user gender gender = new Text(userGender); context.write(gender, one); } }