def METHOD_NAME(
    self, job_id: str, resource_reqs: Dict[str, dict]
) -> Dict[str, Tuple[bool, Optional[str]]]:
    """Sends the check_client_resources requests to the clients.
    Args:
        job_id: ID of the job
        resource_reqs: A dict of {client_name: resource requirements dict}
    Returns:
        A dict of {client_name: client_check_result}.
            client_check_result is a tuple of (is_resource_enough, token);
            is_resource_enough is a bool indicates whether there is enough resources;
            token is for resource reservation / cancellation for this check request.
    """
    pass