引发异常时，kazoo DataWatch不退出程序

Question

我使用的是kazoo=2.2.1，Python2.7，zookeeper 3.4.5--1。我已经设置了一个DataWatch，如果回调引发异常，我想中止程序。我无法使用以下代码中止

from kazoo.recipe.watchers import DataWatch
from utils.zookeeper import Zookeeper
import time
import sys


def do_stuff(data, stat):
   raise NotImplementedError("abort")


def wrap_do_stuff(data, stat):
    try:
        do_stuff(data, stat)
    except Exception as e:
        if data != '':
            print e.message

            # This does not exit the program
            # sys.exit(-1)

            # This does not exit the program
            # raise e

            # This does not exit the program, just stop the watcher
            return False


def start():
    zookeeper_client = Zookeeper.init_from_config().client
    # Someone is writing into this node after creation
    new_node_path = zookeeper_client.create('/test/',
                                        ephemeral=True, sequence=True)
    path_to_watch = new_node_path
    print path_to_watch
    datawatcher = DataWatch(zookeeper_client, path_to_watch, wrap_do_stuff)

    while True:
        time.sleep(2)
        print "still alive"


if __name__ == '__main__':
    start()

`

如何在wrap_do_stuff()中中止