It seems the author is saying that he only sends one email per task,
so the only 'email sent' flag to stick in memcache is the one that is
occurring when the exception is raised. I'm not sure that solution
will work - how can he know if an email has been sent successfully
when the mail API is throwing an exception? He would need a list of
the exceptions that occur *despite* the email being successfully
sent. Seems a bit shaky to me. As the author says, this seems like a
GAE bug - if GAE is going to raise the DeadlineExceededError on the
mail API, then the mail should not be sent - either it succeeds within
the deadline or it fails to meet the deadline - not both. I can see
how this could be tricky to guarantee though....
On Apr 12, 11:15 pm, "Ikai L (Google)" <ika...@google.com> wrote:
> A possible solution would be to store emails where you have already sent a
> message to in Memcache. If the tasks get retried, you check for the presence
> of a key and email hash. If it exists, you don't send the message. If it
> does not, you send the message and insert into Memcache.
>
>
>
>
>
> On Tue, Apr 6, 2010 at 3:33 PM, Ubaldo Huerta <uba...@gmail.com> wrote:
> > I have a task that sends a single email which works well, but every
> > now and then (every 100 emails or so, my guess), the tasks get's
> > retried because of an exception is thrown while sending the email
> > message. The problem is that the email message is actually sent even
> > though the exception below is thrown. So, naturally, I'm lossing face
> > sending duplicate emails. Is there a way around this before the bug
> > gets fixed? :-(
>
> > File "/base/python_lib/versions/1/google/appengine/api/mail.py", line
> > 742, in send
> > make_sync_call('mail', self._API_CALL, message, response)
> > File "/base/python_lib/versions/1/google/appengine/api/
> > apiproxy_stub_map.py", line 78, in MakeSyncCall
> > return apiproxy.MakeSyncCall(service, call, request, response)
> > File "/base/python_lib/versions/1/google/appengine/api/
> > apiproxy_stub_map.py", line 278, in MakeSyncCall
> > rpc.CheckSuccess()
> > File "/base/python_lib/versions/1/google/appengine/api/
> > apiproxy_rpc.py", line 126, in CheckSuccess
> > raise self.exception
> > DeadlineExceededError: The API call mail.Send() took too long to
> > respond and was cancelled.
>
> > --
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>
> --
> Ikai Lan
> Developer Programs Engineer, Google App
> Enginehttp://googleappengine.blogspot.com|http://twitter.com/app_engine
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