/**
  * Constructs the DelegatingRecordReader.
  *
  * @param split TaggegInputSplit object
  * @param context TaskAttemptContext object
  * @throws IOException
  * @throws InterruptedException
  */
 @SuppressWarnings("unchecked")
 public DelegatingRecordReader(InputSplit split, TaskAttemptContext context)
     throws IOException, InterruptedException {
   // Find the InputFormat and then the RecordReader from the
   // TaggedInputSplit.
   TaggedInputSplit taggedInputSplit = (TaggedInputSplit) split;
   InputFormat<K, V> inputFormat =
       (InputFormat<K, V>)
           DCUtils.loadSerializedObjectInDC(
               context.getConfiguration(),
               InputFormat.class,
               taggedInputSplit.getInputFormatFile(),
               true);
   originalRR = inputFormat.createRecordReader(taggedInputSplit.getInputSplit(), context);
 }