title: Celery - Having sequential tasks rather than concurrent?
body: <p>I have a few tasks which use the Amazon API which is limited to 1 req/second.</p>
  
  <p>Therefore I would like to group up tasks which use the Amazon API and have them lined up in a sequential queue.</p>
  
  <p>All I've figured out is how to associate queues to each task. But no idea on how to remove concurrency in a specific queue.</p>
  
  <p>Any ideas?</p>
  
  <p>Thanks a lot! :)</p>