App Engine 无论 task_retry_limit=0，仍然重复执行失败任务

Question

我在使用任务队列的API时遇到了一些问题。当一个任务失败时，appengine总是会再次运行这个任务，即使我已经告诉它不要这样做。

这是相关的代码：

NO_RETRY = TaskRetryOptions(task_retry_limit=0)


class EnqueueTaskDapau(webapp2.RequestHandler):
    def get(self):
        taskqueue.add(
            url='/task_dapau',
            queue_name='DEFAULT',
            retry_options=NO_RETRY
        )


class TaskDapau(webapp2.RequestHandler):
    def get(self):
        logging.warning('Vai dar pau')
        raise BaseException('Deu pau :-)')

    def post(self):
        return self.get()


application = webapp2.WSGIApplication([
    ('/', MainPage),
    ('/enqueue_dapau', EnqueueTaskDapau),
    ('/task_dapau', TaskDapau),
], debug=True)

整个应用程序可以在Github上找到，所以应该很容易复现这个问题。当我在浏览器中访问/enqueue_dapau时，我在日志中看到的内容是这样的（在网页控制台上）：

2014-10-30 08:31:01.054 /task_dapau 500 4ms 0kb AppEngine-Google; (+http://code.google.com/appengine) module=default version=1
W 2014-10-30 08:31:01.052 Vai dar pau
E 2014-10-30 08:31:01.053 Traceback (most recent call last): File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 267, in

2014-10-30 08:31:00.933 /task_dapau 500 3ms 0kb AppEngine-Google; (+http://code.google.com/appengine) module=default version=1
W 2014-10-30 08:31:00.931 Vai dar pau
E 2014-10-30 08:31:00.932 Traceback (most recent call last): File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 267, in

2014-10-30 08:31:00.897 /enqueue_dapau 200 91ms 0kb Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36 module=default version=1

如果我查看网页控制台上的任务队列，我看到“最后一分钟运行次数 == 2”。这个行为和我在本地使用SDK时看到的情况不同：

INFO     2014-10-30 15:49:05,711 module.py:666] default: "GET /enqueue_dapau HTTP/1.1" 200 -
WARNING  2014-10-30 15:49:05,729 views.py:33] Vai dar pau
ERROR    2014-10-30 15:49:05,729 wsgi.py:279] 
Traceback (most recent call last):
  File "/home/tony/google_appengine/google/appengine/runtime/wsgi.py", line 267, in Handle
    result = handler(dict(self._environ), self._StartResponse)
  File "/home/tony/google_appengine/lib/webapp2-2.3/webapp2.py", line 1505, in __call__
    rv = self.router.dispatch(request, response)
  File "/home/tony/google_appengine/lib/webapp2-2.3/webapp2.py", line 1253, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/home/tony/google_appengine/lib/webapp2-2.3/webapp2.py", line 1077, in __call__
    return handler.dispatch()
  File "/home/tony/google_appengine/lib/webapp2-2.3/webapp2.py", line 545, in dispatch
    return method(*args, **kwargs)
  File "/home/tony/work/qmag/gaetests/src/views.py", line 37, in post
    return self.get()
  File "/home/tony/work/qmag/gaetests/src/views.py", line 34, in get
    raise BaseException('Deu pau :-)')
BaseException: Deu pau :-)
INFO     2014-10-30 15:49:05,735 module.py:666] default: "POST /task_dapau HTTP/1.1" 500 -
WARNING  2014-10-30 15:49:05,735 taskqueue_stub.py:1986] Task task4 failed to execute. The task has no remaining retries. Failing permanently after 0 retries and 0 seconds

这是个bug吗？（看起来确实像）

有没有简单的解决办法呢？

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App Engine 无论 task_retry_limit=0，仍然重复执行失败任务

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