def parse_log_level_names(str_log_level_names):
    """20:INFO,30:WARN,40:ERROR,50:FATAL"""
    if not str_log_level_names:
        return {}

    log_levels = str_log_level_names.split(",")
    log_levels = [item.split(":") for item in log_levels]

    level_names = {int(level): name for level, name in log_levels}
    return level_names