code: private void checkUserFileBufferBytes() {
      if (!isSet(PropertyKey.USER_FILE_BUFFER_BYTES)) { // load from hadoop conf
        return;
      }
      long usrFileBufferBytes = getBytes(PropertyKey.USER_FILE_BUFFER_BYTES);
      Preconditions.checkState((usrFileBufferBytes & Integer.MAX_VALUE) == usrFileBufferBytes,
          PreconditionMessage.INVALID_USER_FILE_BUFFER_BYTES.toString(),
          PropertyKey.Name.USER_FILE_BUFFER_BYTES, usrFileBufferBytes);
    }
docs: Validates the user file buffer size is a non-negative number.
  
  @throws IllegalStateException if invalid user file buffer size configuration is encountered