@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>) ReflectionUtils.newInstance( taggedInputSplit.getInputFormatClass(), context.getConfiguration()); originalRR = inputFormat.createRecordReader(taggedInputSplit.getInputSplit(), context); }