public void reduce(Text arg0, Iterator<Text> arg1,
                     OutputCollector<Text, Text> arg2,
                     Reporter arg3) throws IOException {
    throw new IOException("should not be called\n");
  }
public void reduce ( Text arg0 , Iterator < Text > arg1 , OutputCollector < Text , Text > arg2 , Reporter arg3 ) throws IOException { throw new IOException ( "should not be called\n" ) ; }
Do nothing. Should not be called.