[Solved] A periodic task runs twice every minute instead of once. What might cause this? — Ans: Two Celery Beat instances running simultaneously | Django

Django - Celery and Background Tasks

A periodic task runs twice every minute instead of once. What might cause this?

ATwo Celery Beat instances running simultaneously

BTask function has a syntax error

CDjango settings.py missing timezone setting

DCelery worker concurrency set to 2

Step-by-Step Solution

Solution:

Step 1: Understand multiple Beat instances effect
Running two Beat schedulers causes duplicate task scheduling.
Step 2: Exclude other causes
Syntax errors prevent task running; timezone or concurrency don't cause duplicate runs.
Final Answer:
Two Celery Beat instances running simultaneously -> Option A
Quick Check:
Multiple Beat = duplicate task runs [OK]

Quick Trick: Only run one Celery Beat instance to avoid duplicate tasks [OK]

Common Mistakes:

MISTAKES

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A periodic task runs twice every minute instead of once. What might cause this?