def shutdown(self, wait=True):
        pass
Returns a list of key (used in memcache), ratelimit tuples. Keys
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/concurrent/concurrent/futures/_base.py/Executor.shutdown--crossover with--dataset/ETHPy150Open openstack/swift/swift/common/middleware/ratelimit.py/RateLimitMiddleware.get_ratelimitable_key_tuples