Pi's cleanup method

Pi.java

    @Override
    public void cleanup(Context context) throws IOException {
      //write output to a file
      Configuration conf = context.getConfiguration();
      Path outDir = new Path(conf.get(FileOutputFormat.OUTDIR));
      Path outFile = new Path(outDir, "reduce-out");
      FileSystem fileSys = FileSystem.get(conf);
      SequenceFile.Writer writer = SequenceFile.createWriter(fileSys, conf,
          outFile, LongWritable.class, LongWritable.class,
          CompressionType.NONE);
      writer.append(new LongWritable(numInside), new LongWritable(numOutside));
      writer.close();
    }