Executor.java

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.MultipleInputs;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

public class Executor {
	@SuppressWarnings("deprecation")
	public static void main(String[] args) throws Exception 
	{
		//Executer
		 Configuration conf = new Configuration();
		 Job job = Job.getInstance(conf, "Reduce-side join");
		 job.setJarByClass(Executor.class);
		 job.setReducerClass(PageViews_By_User.class);
		 job.setOutputKeyClass(Text.class);
		 job.setOutputValueClass(Text.class);
		  
		 MultipleInputs.addInputPath(job, new Path(args[0]),TextInputFormat.class, Users.class);
		 MultipleInputs.addInputPath(job, new Path(args[1]),TextInputFormat.class, PageViews.class);
		 
		 Path outputPath = new Path(args[2]);
		  
		 FileOutputFormat.setOutputPath(job, outputPath);
		 outputPath.getFileSystem(conf).delete(outputPath);
		 System.exit(job.waitForCompletion(true) ? 0 : 1);
	 }
 }