def split_remote_fileid(remote_file_id):
    """
    Splite remote_file_id to (group_name, remote_file_name)
    arguments:
    @remote_file_id: string
    @return tuple, (group_name, remote_file_name)
    """
    index = remote_file_id.find('/')
    if -1 == index:
        return None
    return remote_file_id[0:index], remote_file_id[index + 1:]
