====== Celery ======
  * http://www.celeryproject.org/
  * Celery is an asynchronous task queue/job queue based on distributed message passing.
  * [[http://blog.miguelgrinberg.com/post/celery-and-the-flask-application-factory-pattern|Celery and the Flask Application Factory Pattern - miguelgrinberg.com]]
  * [[https://www.slideshare.net/kkungkkung/celery-52212762|Celery의 빛과 그림자]]
  * [[https://medium.com/sunhyoups-story/celery-b96eb337b9cf|Celery를 이용한 분산처리 프로세스 작성하기 – Sunhyoup’s Story – Medium]]