@Override
protected void map(Centroid key, IntWritable value, Context context)
throws IOException, InterruptedException {
context.write(new Text(key.toString()), new Text(value.toString()));
}
@Override
protected void map(Centroid key, Point value, Context context)
throws IOException, InterruptedException {
String out = key.toString() + " " + value.toString();
context.write(new Text(out), new Text(""));
}