content: package com.manning.hip.ch13;
  
  
  import org.apache.commons.lang.StringUtils;
  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.Mapper;
  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 java.io.IOException;
  
  public final class ArrayOutOfBounds {
    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();
  
      conf.set("keep.failed.task.files", "true");
  
      Job job = new Job(conf);
      job.setJarByClass(ArrayOutOfBounds.class);
      job.setMapperClass(Map.class);
      job.setNumReduceTasks(0);
  
      job.setInputFormatClass(KeyValueTextInputFormat.class);
      job.setMapOutputKeyClass(Text.class);
      job.setMapOutputValueClass(Text.class);
  
      Path outputPath = new Path(output);
  
      FileInputFormat.setInputPaths(job, input);
      FileOutputFormat.setOutputPath(job, outputPath);
  
      outputPath.getFileSystem(conf).delete(outputPath, true);
  
      job.waitForCompletion(true);
    }
  
    public static class Map
        extends Mapper<Text, Text, Text, Text> {
      Text outputValue = new Text();
      @Override
      protected void map(Text key, Text value, Context context)
          throws IOException, InterruptedException {
        String id = StringUtils.split(value.toString())[5];
        outputValue.set(id);
        context.write(key, outputValue);
      }
    }
  }
  