不知怎的，CELERY_ALWAYS_EAGER = True在Django

Question

我已在测试环境中的django设置中设置CELERY_ALWAYS_EAGER = True。

但不知怎的，我仍然收到了这条消息。

ERROR:cacheback:Unable to trigger task asynchronously - failing over to synchronous refresh
ERROR:cacheback:[Errno 111] Connection refused

实际上CELERY_ALWAYS_EAGER = True有效，这是我从django shell获得的。

$ python manage.py shell
Python 2.7.6 (default, Mar 22 2014, 22:59:56) 
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from django.conf import settings
>>> from celery import Celery
>>> app = Celery()
>>> app.config_from_object('django.conf:settings')
>>> print app.conf.CELERY_ALWAYS_EAGER
True
>>> @app.task()
... def foo():
...   print('FOO')
... 
>>> print foo.delay()
FOO
4ff95b5c-f8bc-412b-ad19-602082aec1e9
>>> 

有什么想法我仍然收到错误消息？非常感谢你！