Celery Queue related events
I have two Django projects, each with a Celery app:
- fooproj.celery_app
- barproj.celery_app
Each application has its own celery worker:
celery worker -A fooproj.celery_app -l info -E -Q foo_queue
celery worker -A barproj.celery_app -l info -E -Q bar_queue
This is how I set up my Celery apps:
import os
from celery import Celery
from django.conf import settings
# set the default Django settings module for the 'celery' program.
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'proj.settings.local')
app = Celery('celery_app', broker=settings.BROKER_URL)
app.conf.update(
CELERY_ACCEPT_CONTENT=['json'],
CELERY_TASK_SERIALIZER='json',
CELERY_RESULT_SERIALIZER='json',
CELERY_RESULT_BACKEND='djcelery.backends.database:DatabaseBackend',
CELERY_SEND_EVENTS=True,
CELERY_DEFAULT_QUEUE=settings.CELERY_DEFAULT_QUEUE,
CELERY_DEFAULT_EXCHANGE=settings.CELERY_DEFAULT_EXCHANGE,
CELERY_DEFAULT_ROUTING_KEY=settings.CELERY_DEFAULT_ROUTING_KEY,
CELERY_DEFAULT_EXCHANGE_TYPE='direct',
CELERY_ROUTES = ('proj.celeryrouters.MainRouter', ),
CELERY_IMPORTS=(
'apps.qux.tasks',
'apps.lorem.tasks',
'apps.ipsum.tasks',
'apps.sit.tasks'
),
)
My router class:
from django.conf import settings
class MainRouter(object):
"""
Routes Celery tasks to a proper exchange and queue
"""
def route_for_task(self, task, args=None, kwargs=None):
return {
'exchange': settings.CELERY_DEFAULT_EXCHANGE,
'exchange_type': 'direct',
'queue': settings.CELERY_DEFAULT_QUEUE,
'routing_key': settings.CELERY_DEFAULT_ROUTING_KEY,
}
fooproj has settings:
BROKER_URL = redis://localhost:6379/0
CELERY_DEFAULT_EXCHANGE = 'foo_exchange'
CELERY_DEFAULT_QUEUE = 'foo_queue'
CELERY_DEFAULT_ROUTING_KEY = 'foo_routing_key'
barproj has settings:
BROKER_URL = redis://localhost:6379/1
CELERY_DEFAULT_EXCHANGE = 'foo_exchange'
CELERY_DEFAULT_QUEUE = 'foo_queue'
CELERY_DEFAULT_ROUTING_KEY = 'foo_routing_key'
As you can see, both projects use their own Redis database as the broker, their own MySQL database as the database, their own exchange, queue and routing key.
I am trying to start two Celery event processes, one for each application:
celery events -A fooproj.celery_app -l info -c djcelery.snapshot.Camera
celery events -A barproj.celery_app -l info -c djcelery.snapshot.Camera
The problem is that both celery manufacturing processes raise challenges from all of my celery workers! So in fooproj database I can see task results from barproj database.
Any idea how to fix this problem?
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From http://celery.readthedocs.org/en/latest/getting-started/brokers/redis.html :
Monitoring events (used by flower and other tools) are global and independent of the virtual host settings.
This is due to a limitation in Redis. Redis PUB / SUB channels are global and independent of the database number.
This is similar to one of Redis' caveats :(
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