'You get no ordering guarantees. Fetching will happen in batch_size
increments. If you\'re using this method, you should be running in an
async task.'

def iter_all_for_block(self, block_key, scope=Scope.user_state, batch_size=None):

    if (scope != Scope.user_state):
        raise ValueError('Only    Scope.user_state    is    supported')
    raise NotImplementedError()
