code: public void setDefaultNamedOutput(OutputFormat outputFormat, Class keyClass, Class valueClass, Map<String, String> specificContext)  throws TupleMRException {
    	namedOutputs.add(new Output(true, "DEFAULT", outputFormat, keyClass, valueClass, specificContext));
    }
docs: Sets the default named output specs. By using this method one can use an arbitrary number of named outputs
  without pre-defining them beforehand.
  <p>
  The specific (key, value) default context defined here will be applied to ALL named outputs.