code: @Override
  	public void configure(Configuration parameters) {
  
  		// enforce sequential configure() calls
  		synchronized (CONFIGURE_MUTEX) {
  			if (this.mapreduceOutputFormat instanceof Configurable) {
  				((Configurable) this.mapreduceOutputFormat).setConf(this.configuration);
  			}
  		}
  	}
docs: --------------------------------------------------------------------------------------------