def __init__(self, todo_tasklet, limit):
    self._todo_tasklet = todo_tasklet
    self._limit = limit
    # A map from "options" to a list of (future, arg) tuple.
    # future is the future return from a single async operations.
    self._queues = {}
    self._running = []  # A list of in-flight todo_tasklet futures.
    self._cache = {}  # Cache of in-flight todo_tasklet futures.
Wraps execute calls for mounting a Quobyte volume
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/ndb/context.py/AutoBatcher.__init__--crossover with--dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/virt/libvirt/volume/quobyte.py/mount_volume