Hadoop MultipleOutputs

Want to generate various types of output files. For example, I have a huge linkgraph with includes timestamp and the outlink information. I want put these two constrains into seperate files. Here is how to use MultipleOutputFormat for this purpose:

public static class FinalLayersReducer extends Reducer<IntWritable, Text, WritableComparable,Writable> 
{
     public void setup(Context context) 
     {
          mos = new MultipleOutputs(context);
     }
  
     public void reduce(IntWritable key, Iterable<text> values, Context context) throws IOException, InterruptedException {
          for ( Text val : values) {
          // some sort of a computation ..
          }
          mos.write("outlink", key, outlink_text);
          mos.write("timestamp", key, timestamp_text);
     }

     protected void cleanup(Context context) throws IOException, InterruptedException {
          mos.close();
     }
}

public static void main(String[] args) throws Exception {

     Job job = new Job(conf, "prepare final layer files");
     
     // other job settings ..

     MultipleOutputs.addNamedOutput(job, "outlink", TextOutputFormat.class , IntWritable.class, Text.class);
     MultipleOutputs.addNamedOutput(job, "timestamp", TextOutputFormat.class , IntWritable.class, Text.class);
}

Facing zero sized output files OR lines in the 2 separate outputs do not match when they supposed to OR can not unzip the output files -> these are signs are telling that you forget to close() the MultipleOutputs object at the end - in the cleanup() function.