code: private String calculateChecksum(AlluxioURI filePath)
        throws AlluxioException, IOException {
      OpenFilePOptions options =
          OpenFilePOptions.newBuilder().setReadType(ReadPType.NO_CACHE).build();
      try (FileInStream fis = mFileSystem.openFile(filePath, options)) {
        return DigestUtils.md5Hex(fis);
      }
    }
docs: Calculates the md5 checksum for a file.
  
  @param filePath The {@link AlluxioURI} path of the file calculate MD5 checksum on
  @return A string representation of the file's MD5 checksum