On Tue, Jan 2, 2018 at 11:14 PM, Mukul Mantosh <mukulmantos...@gmail.com>
wrote:
> I am not using result backend my question is that when the broker
> connection is lost it throws a connection refused exception which i could
> normally catch through the following given below code.
>
> *try:*
> * add.delay(2, 2)*
> *except add.OperationalError as exc:*
> * print('error');*
>
> Reference 1: http://docs.celeryproject.org/en/latest/userguide/
> calling.html#connection-error-handling
> Reference 2: https://github.com/celery/celery/issues/3933
>
>
> This try except block works only one time and next time when i try to call
> again add.delay(2,2)....the code is waiting to execute because celery is
> re-trying to establish the connection with the broker.
>
>
I'm not sure about understanding you, where are you trying to call it
again? from ipython?
> I just simply don't want to do, for example: There is a website where a
> user signup as a new user and we have to send an verification email through
> celery and suddenly the connection gets lost then the code will be in
> waiting state because celery is again retrying to establish a connection
> with the lost broker.
>
>
I agree that this may be better for a celery mailing list, as "low level"
celery is probably not the main expertise of most of the people reading
here, as Jason said, for what I understand
http://docs.celeryproject.org/en/latest/userguide/calling.html#calling-retry
should be sufficient for the "normal" cases.
Have in mind that exception will be raised at the celery level, not django
because it's async,
http://docs.celeryproject.org/en/latest/userguide/calling.html#linking-callbacks-errbacks.
Django delegates the task to celery and celery takes care of executing it.
If you need to perfect warranty of execution, do it sync, inside the django
view send the verification mail, where you can show to the user that the
confirmation mail hasn't been sent.
> How can we solve this problem ?
>
>
For what I understood, your problem is assuming that if a celery task
fails, it won't be retried :)
>
>
> On Wednesday, January 3, 2018 at 12:45:10 AM UTC+5:30, Jason wrote:
>>
>> With a broker connection loss, the only thing that will happen is your
>> workers won't pick up new tasks.
>>
>> If you're posting to a result backend like redis and lose the connection,
>> then an exception will be raised in the logs and the task will shut down.
>>
>> Remember tasks are independent processes and you can tell each worker how
>> many tasks to execute before its process is killed.
>>
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