code: @Override
      public void prepareToRead(@SuppressWarnings("rawtypes") RecordReader newReader, PigSplit pigSplit) {
          // Note that for this Loader, we don't care about the PigSplit.
          if (newReader instanceof ApacheHttpdLogfileRecordReader) {
              this.reader = (ApacheHttpdLogfileRecordReader) newReader;
          } else {
              throw new IncorrectRecordReaderException();
          }
      }
docs: ------------------------------------------