content: package com.manning.hip.ch3.binary;
  
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.io.BytesWritable;
  import org.apache.hadoop.io.LongWritable;
  import org.apache.hadoop.io.Text;
  import org.apache.hadoop.mapreduce.Job;
  import org.apache.hadoop.mapreduce.Mapper;
  import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
  import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
  
  import java.io.IOException;
  
  public final class CustomBinaryMapReduce {
    public static class Map extends Mapper<LongWritable, BytesWritable,
        LongWritable, LongWritable> {
  
      @Override
      protected void map(LongWritable key, BytesWritable value,
                         Context context)
          throws
          IOException, InterruptedException {
  
        int len = value.getLength();
        context.write(
            key,
            new LongWritable(len));
      }
    }
  
    public static void main(String... args) throws Exception {
      runJob(args[0], args[1]);
    }
  
    public static void runJob(String input,
                              String output)
        throws Exception {
      Configuration conf = new Configuration();
  
      Job job = new Job(conf);
      job.setJarByClass(CustomBinaryMapReduce.class);
      job.setOutputKeyClass(Text.class);
      job.setOutputValueClass(Text.class);
      job.setMapperClass(Map.class);
      job.setInputFormatClass(CustomBinaryInputFormat.class);
      job.setNumReduceTasks(0);
      job.setMapOutputValueClass(LongWritable.class);
  
      FileInputFormat.setInputPaths(job, new Path(input));
      Path outPath = new Path(output);
      FileOutputFormat.setOutputPath(job, outPath);
  
      outPath.getFileSystem(conf).delete(outPath, true);
  
      job.waitForCompletion(true);
    }
  }
  