@SuppressWarnings("unchecked")
    public void reduce(
        Text key,
        Iterator<Text> values,
        OutputCollector<NullWritable, Text> output,
        Reporter reporter)
        throws IOException {

      OutputCollector collector =
          multipleOutputs.getCollector("station", key.toString().replace("-", ""), reporter);
      while (values.hasNext()) {
        collector.collect(NullWritable.get(), values.next());
      }
    }
  @Override
  public int run(String[] args) throws IOException {
    JobConf conf = JobBuilder.parseInputAndOutput(this, getConf(), args);
    if (conf == null) {
      return -1;
    }

    conf.setMapperClass(StationMapper.class);
    conf.setMapOutputKeyClass(Text.class);
    conf.setReducerClass(MultipleOutputsReducer.class);
    conf.setOutputKeyClass(NullWritable.class);
    conf.setOutputFormat(NullOutputFormat.class); // suppress empty part file

    MultipleOutputs.addMultiNamedOutput(
        conf, "station", TextOutputFormat.class, NullWritable.class, Text.class);

    JobClient.runJob(conf);
    return 0;
  }
 @Override
 public void close() throws IOException {
   multipleOutputs.close();
 }