[Solved] Given this Celery Beat schedule snippet in Django settings: beat_schedule = { 'print-time': { 'task': 'app.tasks.print_time', 'schedule':... | Django

Django - Celery and Background Tasks

Given this Celery Beat schedule snippet in Django settings:

beat_schedule = {
  'print-time': {
    'task': 'app.tasks.print_time',
    'schedule': crontab(minute='*/15')
  }
}

What will happen when Celery Beat and worker run?

AThe task will not run due to syntax error

BThe task runs only once at minute 15

CThe task runs every hour at minute 0

DThe task 'print_time' runs every 15 minutes

Step-by-Step Solution

Solution:

Step 1: Interpret crontab(minute='*/15')
This means the task runs every 15 minutes, at minute 0, 15, 30, 45 of each hour.
Step 2: Understand Celery Beat behavior
When both Beat and worker run, Beat triggers the task on schedule, so it runs repeatedly every 15 minutes.
Final Answer:
The task 'print_time' runs every 15 minutes -> Option D
Quick Check:
crontab '*/15' means every 15 minutes [OK]

Quick Trick: */15 in crontab means every 15 minutes [OK]

Common Mistakes:

MISTAKES

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