self.conns.empty() in Pool.close will not work as expected by big chance about momoko HOT 3 OPEN

def connect(self):
    future = Future()
    assert self.conns.total <= self.size, "total should not greater than size"
    size = self.size - self.conns.total

    #add check here
    if 0 == size and self.conns.all_dead:

        def on_getconn(fut):
            try:
                conn = fut.result()
            except Exception as error:
                future.set_exc_info(sys.exc_info())
            else:
                future.set_result(self)
                self.putconn(conn)

        self.ioloop.add_future(self.getconn(), on_getconn)
        return future

    #change pending count here
    pending = [max(size-1, 0)]

    def on_connect(fut):
        if pending[0]:
            pending[0] -= 1
            return
        # all connection attempts are complete
        if self.conns.dead and self.raise_connect_errors:
            ecp = PartiallyConnectedError("%s connection(s) failed to connect" % len(self.conns.dead))
            future.set_exception(ecp)
        else:
            future.set_result(self)
        log.debug("All initial connection requests complete")

    #create connection use altered size
    for i in range(size):
        self.ioloop.add_future(self._new_connection(), on_connect)

    return future

            if self.conns.total:
                self.ioloop.add_future(self._reanimate(), on_reanimate_done)
            else:
                #new db object, and haven't invoked connect(),start with one connection
                self.ioloop.add_future(self._new_connection(), on_reanimate_done)