mapreduce对一维的数组进行排序

import java.io.IOException;





import org.apache.hadoop.io.IntWritable;

import org.apache.hadoop.io.LongWritable;

import org.apache.hadoop.io.Text;

import org.apache.hadoop.mapred.MapReduceBase;

import org.apache.hadoop.mapred.Mapper;

import org.apache.hadoop.mapred.OutputCollector;

import org.apache.hadoop.mapred.Reporter;





public class SortMapper extends MapReduceBase implements Mapper<LongWritable, Text, IntWritable,Text> {



	@Override

	public void map(LongWritable key, Text value, OutputCollector<IntWritable,Text> output,

			Reporter reporter) throws IOException {

		// TODO Auto-generated method stub

		

		String line=value.toString();

		System.out.println(line);

		output.collect(new IntWritable(Integer.parseInt(line)),new Text());

		

	}



}

import java.io.IOException;

import org.apache.hadoop.fs.Path;

import org.apache.hadoop.io.IntWritable;

import org.apache.hadoop.io.Text;

import org.apache.hadoop.mapred.FileInputFormat;

import org.apache.hadoop.mapred.FileOutputFormat;

import org.apache.hadoop.mapred.JobClient;

import org.apache.hadoop.mapred.JobConf;





public class Sort {



	/**

	 * @param args

	 * @throws IOException 

	 */

	public static void main(String[] args) throws IOException {

		// TODO Auto-generated method stub

		if(args.length!=2){

			System.out.println("ge shi cuowu");

			System.exit(-1);

		}

		

		JobConf conf=new JobConf(Sort.class);

		

		conf.setJobName("Sort Test");

		

		

		FileInputFormat.setInputPaths(conf, new Path(args[0]));

		//FileOutputFormat.setCompressOutput(conf, true);

		FileOutputFormat.setOutputPath(conf, new Path(args[1]));

		conf.setMapperClass(SortMapper.class);

		//conf.setOutputKeyClass(Text.class);

		//conf.setOutputValueClass(IntWritable.class);

		conf.setMapOutputKeyClass(IntWritable.class);

		conf.setMapOutputValueClass(Text.class);

		

		JobClient.runJob(conf);



	}



}