def __init__(self, scheduler_pool):
        self._logger = get_logger(__name__)
        self._scheduler_pool = scheduler_pool
        self._builds_waiting_for_slaves = Queue()
        self._request_queue = Queue()
        self._request_queue_worker_thread = SafeThread(
            target=self._build_preparation_loop, name='RequestHandlerLoop', daemon=True)
        self._project_preparation_locks = {}
        self._subjob_calculator = SubjobCalculator()
Append OAuth params to an existing set of parameters.
dataset/ETHPy150Open box/ClusterRunner/app/master/build_request_handler.py/BuildRequestHandler.__init__--crossover with--dataset/ETHPy150Open CouchPotato/CouchPotatoServer/libs/oauthlib/oauth1/rfc5849/parameters.py/_append_params