PopularityLeague.java

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.ArrayWritable;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.KeyValueTextInputFormat;
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 java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;

public class PopularityLeague extends Configured implements Tool {

    public static void main(String[] args) throws Exception {
        int res = ToolRunner.run(new Configuration(), new PopularityLeague(), args);
        System.exit(res);
    }

    @Override
    public int run(String[] args) throws Exception {
        //TODO
    }

    public static class IntArrayWritable extends ArrayWritable {
        public IntArrayWritable() {
            super(IntWritable.class);
        }

        public IntArrayWritable(Integer[] numbers) {
            super(IntWritable.class);
            IntWritable[] ints = new IntWritable[numbers.length];
            for (int i = 0; i < numbers.length; i++) {
                ints[i] = new IntWritable(numbers[i]);
            }
            set(ints);
        }
    }

    public static String readHDFSFile(String path, Configuration conf) throws IOException{
        Path pt=new Path(path);
        FileSystem fs = FileSystem.get(pt.toUri(), conf);
        FSDataInputStream file = fs.open(pt);
        BufferedReader buffIn=new BufferedReader(new InputStreamReader(file));

        StringBuilder everything = new StringBuilder();
        String line;
        while( (line = buffIn.readLine()) != null) {
            everything.append(line);
            everything.append("\n");
        }
        return everything.toString();
    }

    //TODO
}