lalit97

lalit97

When to use Celery

1. To do any network call in a request-response cycle

   Sending the email is a network call and might take 2-3 seconds. User should not be made to wait for these 2-3 seconds. So sending activation email should be done outside of request-response cycle. It can be achieved using celery.

2. Breaking a large task consisting of several independent parts into smaller tasks

   If you write a single function to sequentially hit 5 endpoints provided by FB and if network calls take 2 seconds at an average, then your function will take 10 seconds to complete. So you can split your work in 5 individual tasks(it’s very easy to do as we will soon see), and let Celery handle the tasks. Celery can hit these 5 endpoints parallely and you can get the response from all the endpoints within first 2 seconds.

lalit97

In [1]: from pdfs.models import Question, Choice

In [2]: Question.objects.count()
Out[2]: 0

In [3]: Choice.objects.count()
Out[3]: 0

In [4]: q = Question(
   ...:     question_text="who is best football player?"