Celery check pending tasks number before specified taskid

Question

Does celery support returning pending tasks number before given task id?

For example, without celery worker started, I push task1, task2, task3, all the three are pending, now, what I wanna is, if I give task3, it tells me there are 2 pending tasks before 3.

I use celery celery 4.1, rabbitmq 3.5.4 as broker, and redis 3.2.9 as result backend.

Although I can get rabbit queue depth by management API(e.g. get_queue_depth from pyrabbit package), this results the whole queue depth, not pending number before specified task id.

And I know I could maintain a queue managing pushed task ids by myself.

But I wanna if there is any easy way by celery or rabbitmq itself.

Thanks.

Answer 1

I'm not sure if it answer your question but there is control client that can help you to inspect reserved tasks, active tasks and so on..

i = app.control.inspect()
i.reserved()

#output:
[{'worker1.example.com':
    [{'name': 'tasks.sleeptask',
      'id': '32666e9b-809c-41fa-8e93-5ae0c80afbbf',
      'args': '(8,)',
      'kwargs': '{}'}]}]

for more info: http://docs.celeryproject.org/en/latest/userguide/workers.html#dump-of-reserved-tasks

You can also monitor/inspect from command line: http://docs.celeryproject.org/en/latest/userguide/monitoring.html#commands