code: private void createDstDir(AlluxioURI dstPath) throws AlluxioException, IOException {
      try {
        mFileSystem.createDirectory(dstPath);
      } catch (FileAlreadyExistsException e) {
        // it's fine if the directory already exists
      }
  
      URIStatus dstStatus = mFileSystem.getStatus(dstPath);
      if (!dstStatus.isFolder()) {
        throw new InvalidPathException(ExceptionMessage.DESTINATION_CANNOT_BE_FILE.getMessage());
      }
    }
docs: Creates a directory in the Alluxio filesystem space. It will not throw any exception if the
  destination directory already exists.
  
  @param dstPath the {@link AlluxioURI} of the destination directory which will be created