WordCount Mapper class

WordCountDriver.java

package com.spnotes.hadoop;

import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;



public class WordCountDriver extends Configured implements Tool{

	Logger logger = LoggerFactory.getLogger(WordCountDriver.class);
	
	public static void main(String[] args) throws Exception{
		int exitCode = ToolRunner.run(new WordCountDriver(), args);
		System.exit(exitCode);

	}

	public int run(String[] args) throws Exception {
		if (args.length != 2) {
			System.err.printf("Usage: %s [generic options] <input> <output>\n",
					getClass().getSimpleName());
			ToolRunner.printGenericCommandUsage(System.err);
			return -1;
		}
	
		Job job = new org.apache.hadoop.mapreduce.Job();
		job.setJarByClass(WordCountDriver.class);
		job.setJobName("WordCounter");
		
		logger.info("Input path " + args[0]);
		logger.info("Oupput path " + args[1]);
		
		FileInputFormat.addInputPath(job, new Path(args[0]));
		FileOutputFormat.setOutputPath(job, new Path(args[1]));
	
		job.setOutputKeyClass(Text.class);
		job.setOutputValueClass(IntWritable.class);
		job.setOutputFormatClass(TextOutputFormat.class);
		job.setMapperClass(WordCountMapper.class);
		job.setReducerClass(WordCountReducer.class);
	
		int returnValue = job.waitForCompletion(true) ? 0:1;
		System.out.println("job.isSuccessful " + job.isSuccessful());
		return returnValue;
	}

}