How to send periodic tasks to specific queue in Celery

How to send periodic tasks to specific queue in Celery

To send periodic tasks to a specific queue in Celery, you can use Celery's built-in scheduler called "Celery Beat." Celery Beat allows you to schedule periodic tasks (also known as cron-like tasks) and specify the queue to which those tasks should be sent.

Here are the steps to send periodic tasks to a specific queue in Celery:

  1. Configure Celery:

    Make sure you have Celery installed and configured in your project. You should have a Celery instance with the necessary configuration settings.

  2. Configure Celery Beat:

    Celery Beat is a separate process that schedules periodic tasks. Create a celeryconfig.py or celery.py file to configure Celery Beat. In this configuration file, you can specify the schedule for your periodic tasks and set the queue for each task. Here's an example:

    from celery import Celery app = Celery('myapp') app.conf.beat_schedule = { 'my-periodic-task': { 'task': 'myapp.tasks.my_periodic_task', # The name of the task 'schedule': 60.0, # Every 60 seconds 'options': {'queue': 'my_queue'} # Specify the queue here }, }

    In the above configuration, we define a periodic task named 'my-periodic-task'. We specify the task's name, schedule (every 60 seconds in this example), and set the queue to 'my_queue' using the 'options' parameter.

  3. Define the Task:

    Create a Celery task in your application that matches the task name specified in the schedule. In the example above, the task name is 'myapp.tasks.my_periodic_task'. Make sure this task is decorated with @app.task.

    from celery import Celery app = Celery('myapp') @app.task def my_periodic_task(): # Your task logic here

  4. Run Celery Beat:

    Start the Celery Beat scheduler to run the periodic tasks according to the schedule you defined. Run the following command in your terminal:

    celery -A myapp beat

    Replace 'myapp' with the name of your Celery application.

Celery Beat will now schedule and send the 'my-periodic-task' to the 'my_queue' queue at the specified intervals.

Ensure that you have the necessary Celery workers running with access to the specified queue ('my_queue' in this example) to process the tasks when they are scheduled.

Examples

  1. "Celery periodic tasks to specific queue example"

    • Description: This query seeks a basic example of sending periodic tasks to a specific queue in Celery.
    • Code:
      from celery import Celery from celery.schedules import crontab app = Celery('tasks', broker='redis://localhost:6379/0') @app.task(queue='specific_queue') def periodic_task(): print("This is a periodic task sent to a specific queue") app.conf.beat_schedule = { 'periodic_task': { 'task': 'tasks.periodic_task', 'schedule': crontab(minute='*/15'), # Run every 15 minutes }, } if __name__ == '__main__': app.start()

  2. "Celery periodic tasks to specific queue with custom routing example"

    • Description: This query targets sending periodic tasks to a specific queue with custom routing in Celery.
    • Code:
      from celery import Celery from celery.schedules import crontab from kombu import Exchange, Queue app = Celery('tasks', broker='redis://localhost:6379/0') app.conf.task_queues = ( Queue('specific_queue', routing_key='specific_queue'), ) app.conf.beat_schedule = { 'periodic_task': { 'task': 'tasks.periodic_task', 'schedule': crontab(minute='*/15'), # Run every 15 minutes 'options': {'queue': 'specific_queue'} }, } if __name__ == '__main__': app.start()

  3. "Celery periodic tasks to specific queue with custom routing key example"

    • Description: This query aims to find an example of sending periodic tasks to a specific queue with a custom routing key in Celery.
    • Code:
      from celery import Celery from celery.schedules import crontab from kombu import Exchange, Queue app = Celery('tasks', broker='redis://localhost:6379/0') app.conf.task_queues = ( Queue('specific_queue', routing_key='specific_key'), ) app.conf.beat_schedule = { 'periodic_task': { 'task': 'tasks.periodic_task', 'schedule': crontab(minute='*/15'), # Run every 15 minutes 'options': {'queue': 'specific_queue'} }, } if __name__ == '__main__': app.start()

  4. "Celery periodic tasks to specific queue with priority example"

    • Description: This query focuses on sending periodic tasks to a specific queue with priority in Celery.
    • Code:
      from celery import Celery from celery.schedules import crontab from kombu import Exchange, Queue app = Celery('tasks', broker='redis://localhost:6379/0') app.conf.task_queues = ( Queue('specific_queue', routing_key='specific_key', queue_arguments={'x-max-priority': 10}), ) app.conf.beat_schedule = { 'periodic_task': { 'task': 'tasks.periodic_task', 'schedule': crontab(minute='*/15'), # Run every 15 minutes 'options': {'queue': 'specific_queue'} }, } if __name__ == '__main__': app.start()

  5. "Celery periodic tasks to specific queue with rate limiting example"

    • Description: This query aims to find an example of sending periodic tasks to a specific queue with rate limiting in Celery.
    • Code:
      from celery import Celery from celery.schedules import crontab app = Celery('tasks', broker='redis://localhost:6379/0') @app.task(queue='specific_queue', rate_limit='10/m') def periodic_task(): print("This is a periodic task sent to a specific queue with rate limiting") app.conf.beat_schedule = { 'periodic_task': { 'task': 'tasks.periodic_task', 'schedule': crontab(minute='*/15'), # Run every 15 minutes }, } if __name__ == '__main__': app.start()

  6. "Celery periodic tasks to specific queue with retry policy example"

    • Description: This query targets sending periodic tasks to a specific queue with a retry policy in Celery.
    • Code:
      from celery import Celery from celery.schedules import crontab app = Celery('tasks', broker='redis://localhost:6379/0') @app.task(queue='specific_queue', retry_policy={'max_retries': 3}) def periodic_task(): print("This is a periodic task sent to a specific queue with retry policy") app.conf.beat_schedule = { 'periodic_task': { 'task': 'tasks.periodic_task', 'schedule': crontab(minute='*/15'), # Run every 15 minutes }, } if __name__ == '__main__': app.start()

  7. "Celery periodic tasks to specific queue with time limit example"

    • Description: This query focuses on sending periodic tasks to a specific queue with a time limit in Celery.
    • Code:
      from celery import Celery from celery.schedules import crontab app = Celery('tasks', broker='redis://localhost:6379/0') @app.task(queue='specific_queue', time_limit=30) def periodic_task(): print("This is a periodic task sent to a specific queue with time limit") app.conf.beat_schedule = { 'periodic_task': { 'task': 'tasks.periodic_task', 'schedule': crontab(minute='*/15'), # Run every 15 minutes }, } if __name__ == '__main__': app.start()

  8. "Celery periodic tasks to specific queue with custom serializer example"

    • Description: This query aims to find an example of sending periodic tasks to a specific queue with a custom serializer in Celery.
    • Code:
      from celery import Celery from celery.schedules import crontab app = Celery('tasks', broker='redis://localhost:6379/0') @app.task(queue='specific_queue', serializer='json') def periodic_task(): print("This is a periodic task sent to a specific queue with custom serializer") app.conf.beat_schedule = { 'periodic_task': { 'task': 'tasks.periodic_task', 'schedule': crontab(minute='*/15'), # Run every 15 minutes }, } if __name__ == '__main__': app.start()

  9. "Celery periodic tasks to specific queue with task time limit example"

    • Description: This query focuses on sending periodic tasks to a specific queue with a task time limit in Celery.
    • Code:
      from celery import Celery from celery.schedules import crontab app = Celery('tasks', broker='redis://localhost:6379/0') @app.task(queue='specific_queue', task_time_limit=30) def periodic_task(): print("This is a periodic task sent to a specific queue with task time limit") app.conf.beat_schedule = { 'periodic_task': { 'task': 'tasks.periodic_task', 'schedule': crontab(minute='*/15'), # Run every 15 minutes }, } if __name__ == '__main__': app.start()

  10. "Celery periodic tasks to specific queue with soft and hard time limit example"

    • Description: This query aims to find an example of sending periodic tasks to a specific queue with soft and hard time limits in Celery.
    • Code:
      from celery import Celery from celery.schedules import crontab app = Celery('tasks', broker='redis://localhost:6379/0') @app.task(queue='specific_queue', soft_time_limit=30, time_limit=60) def periodic_task(): print("This is a periodic task sent to a specific queue with soft and hard time limits") app.conf.beat_schedule = { 'periodic_task': { 'task': 'tasks.periodic_task', 'schedule': crontab(minute='*/15'), # Run every 15 minutes }, } if __name__ == '__main__': app.start()

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