now process tasks with apache server about django-background-tasks

[philippeowagner]

Have you something that keeps the background tasks up and running according to the README (see https://github.com/arteria/django-background-tasks#running-tasks)?

[zhaochy1990]

yes, I followed the README.

I tried to solve this problem today, with python manage.py process_tasks -v 3 --log-level=DEBUG. what I discovered is when django-background-tasks query for the tasks from database, it found no task. But in fact, all the tasks are stored in database.

I execute the query clause in my db console. the result shows all my tasks, this means the query is correct, but django-background-tasks find no task.

The following is the query clause:

QUERY = u'SELECT "background_task"."id", "background_task"."task_name", "background_task"."task_params", "background_task"."task_hash", "background_task"."priority", "background_task"."run_at", "background_task"."queue", "background_task"."attempts", "background_task"."failed_at", "background_task"."last_error", "background_task"."locked_by", "background_task"."locked_at" FROM "background_task" WHERE (("background_task"."locked_by" IS NULL OR "background_task"."locked_at" < %s) AND "background_task"."failed_at" IS NULL AND "background_task"."run_at" <= %s) ORDER BY "background_task"."priority" DESC, "background_task"."run_at" ASC' - PARAMS = (u'2016-07-11 14:37:59.072193', u'2016-07-11 15:37:59.072193'); args=(u'2016-07-11 14:37:59.072193', u'2016-07-11 15:37:59.072193')

after this query, it prints debug message

DEBUG:root:waiting for tasks

and then repeat this status again and again...

By the way, I'm using postgresql. Thank you very much.

[philippeowagner]

What happens if you call python manage.py process_tasks in the production (virtual) env?
Basically 2 tasks must be running

• 1 for processing requests and
• 1 to process the tasks in the queue.

[zhaochy1990]

I'm not quite understand what you said "2 tasks", you mean 2 process?
What I said above is on my production env, the background tasks works fine with my develop env.

When i call python manage.py process_tasks, it shows nothing in the console.
And when i checking the running process, I only find one running process
zhaochy 24639 24616 0 00:26 pts/21 00:00:01 python ./manage.py process_tasks

[philippeowagner]

Yes, you're right – two processes, not two tasks.

[philippeowagner]

@zhaochy1990 could you manage to make it work? Please close the filed issue in this case or provide more information about your setup, settings, source, ..
Thank you.

[pstragli]

Hi I'm running into the same issue stated by @zhaochy1990.
Tasks are being created correctly in the background_tasks table but when I run python manage.py process_tasks they are actually processed on dev environment only, while they are not processed in the production env (though by debugging, the generated SQL queries result in being correct).
I also see only one running process:
1055 11152 0.0 0.1 287480 42952 pts/2 S+ 09:19 0:02 python2.7 manage.py process_tasks

@zhaochy1990 how did you solve the problem? Thanks in advance.

[zhaochy1990]

I use celery instead