GAE Python Deferred.defer 设置“task_retry_limit”不起作用

Question

我希望我的推迟任务在失败后才再次尝试。

阅读此相关问题后：Specifying retry limit fortasks queued using GAE deferred library很明显，我需要遵循已接受的答案，因此我将代码修改为如下所示：

from google.appengine.ext import deferred

deferred.defer(MyFunction, DATA, _retry_options={'task_retry_limit': 1})

现在我得到这个错误：

File "/usr/local/google-cloud-sdk/platform/google_appengine/google/appengine/ext/deferred/deferred.py", line 269, in defer
    return task.add(queue, transactional=transactional)
File "/usr/local/google-cloud-sdk/platform/google_appengine/google/appengine/api/taskqueue/taskqueue.py", line 1143, in add
    return self.add_async(queue_name, transactional).get_result()
File "/usr/local/google-cloud-sdk/platform/google_appengine/google/appengine/api/taskqueue/taskqueue.py", line 1139, in add_async
    return Queue(queue_name).add_async(self, transactional, rpc)
File "/usr/local/google-cloud-sdk/platform/google_appengine/google/appengine/api/taskqueue/taskqueue.py", line 1889, in add_async
rpc)
File "/usr/local/google-cloud-sdk/platform/google_appengine/google/appengine/api/taskqueue/taskqueue.py", line 2008, in __AddTasks
    fill_request(task, request.add_add_request(), transactional)
File "/usr/local/google-cloud-sdk/platform/google_appengine/google/appengine/api/taskqueue/taskqueue.py", line 2093, in __FillAddPushTasksRequest
    task.retry_options, task_request.mutable_retry_parameters())
File "/usr/local/google-cloud-sdk/platform/google_appengine/google/appengine/api/taskqueue/taskqueue.py", line 2033, in __FillTaskQueueRetryParameters
    if retry_options.min_backoff_seconds is not None:
AttributeError: 'dict' object has no attribute 'min_backoff_seconds'

显然我犯了一个愚蠢的错误，我只是不明白那是什么。

Answer 1

您需要传递一个TaskRetryOptions实例，而不仅仅是一个字典：

from google.appengine.ext import deferred
from google.appengine.api.taskqueue import TaskRetryOptions

options = TaskRetryOptions(task_retry_limit=1)
deferred.defer(MyFunction, DATA, _retry_options=options)