code: @Override
    public FSDataInputStream open(Path path, int bufferSize) throws IOException {
      LOG.debug("open({}, {})", path, bufferSize);
      if (mStatistics != null) {
        mStatistics.incrementReadOps(1);
      }
  
      AlluxioURI uri = new AlluxioURI(HadoopUtils.getPathWithoutScheme(path));
      return new FSDataInputStream(new HdfsFileInputStream(mFileSystem, uri, mStatistics));
    }
docs: TODO(calvin): Consider respecting the buffer size option