google-app-engine - ndb async 是否保证在应用程序请求完成后执行？

Question

我正在使用 ndb 编写一个分析模型，该模型记录每个应用程序请求的一些数据。每个请求通过 ndb.put_async 调用一个 ndb 请求来记录数据，而客户端不关心结果。本质上，我不希望应用程序请求等待保存统计数据以进行分析。

然而，我对官方文档的解释感到困惑。如果应用程序请求在 ndb 请求完成之前完成，是否仍能保证 ndb 请求完成？文档表明

if the request handler exists too early, the put might never happen

在什么条件下会发生这种情况？这是否意味着无论用户是否关心结果，都需要调用 future.get_result 以确保执行 ndb 请求？

原始文档 ( https://developers.google.com/appengine/docs/python/ndb/async ) 说:

In this example, it's a little silly to call future.get_result: the application never uses the result from NDB. That code is just in there to make sure that the request handler doesn't exit before the NDB put finishes; if the request handler exits too early, the put might never happen. As a convenience, you can decorate the request handler with @ndb.toplevel. This tells the handler not to exit until its asynchronous requests have finished. This in turn lets you send off the request and not worry about the result.

Answer 1

If an application request has finished before the ndb request finishes, would the ndb request still be guaranteed to finish?

没有。

Does this mean that regardless of whether a user care about the result, future.get_result needs to be called anyway just to make sure the ndb request is performed?

基本上是的，但是为了方便起见，您可以使用 ndb.toplevel 装饰器，这样您就不必显式地等待结果。也就是说，我认为这不是您想要的。

可能 taskqueue是你想要的。请检查一下。