需要帮助这个Kombu错误

Question

Pardon the copy and paste from the python interpreter but I'm trying to play with Kombu but I can't seem to create a consumer. Please help, I'm utterly in the dark here.

>>> from kombu.messaging import Consumer, Producer
>>> from kombu.entity import Exchange, Queue
>>> x = Exchange("stmt",type="topic")
>>> helloQ = Queue("hello", exchange=x, routing_key="stmt.hello")
>>>
>>> from kombu.connection import BrokerConnection
>>> conn = BrokerConnection("scheduledb.lab.compete.com", "clippy", "clippy", "clippy")
>>> channel = conn.channel()
>>> c = Consumer(channel, helloQ)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/messaging.py", line 231, in __init__
self.declare()
File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/messaging.py", line 241, in declare
    queue.declare()
File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/entity.py", line 362, in declare
    self.name and self.queue_declare(nowait, passive=False),
File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/entity.py", line 380, in queue_declare
    nowait=nowait)
  File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/syn.py", line 14, in blocking
    return __sync_current(fun, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/syn.py", line 30, in __blocking__
    return fun(*args, **kwargs)
File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/channel.py", line 1294, in queue_declare
File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/abstract_channel.py", line 89, in wait
File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/connection.py", line 218, in _wait_method
File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/abstract_channel.py", line 105, in wait
File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/connection.py", line 367, in _close
amqplib.client_0_8.exceptions.AMQPConnectionException: (530, u"NOT_ALLOWED - parameters for queue 'hello' in vhost 'clippy' not equivalent", (50, 10), 'Channel.queue_declare')
>>> boundX = x(helloQ)
>>> c = Consumer(channel, helloQ)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/messaging.py", line 231, in __init__
    self.declare()
  File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/messaging.py", line 241, in declare
    queue.declare()
  File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/entity.py", line 361, in declare
    return (self.name and self.exchange.declare(nowait),
  File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/entity.py", line 151, in declare
nowait=nowait)
  File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/syn.py", line 14, in blocking
    return __sync_current(fun, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/syn.py", line 30, in __blocking__
     return fun(*args, **kwargs)
  File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/channel.py", line 839, in exchange_declare
  File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/abstract_channel.py", line 69, in _send_method
AttributeError: 'NoneType' object has no attribute 'method_writer'

Answer 1

Look at the error

amqplib.client_0_8.exceptions.AMQPConnectionException: (530, u"NOT_ALLOWED - parameters for queue 'hello' in vhost 'clippy' not equivalent", (50, 10), 'Channel.queue_declare')

This means the queue has already been declared, but with other parameters than what you are declaring it with now.

Answer 2

Adding to @asksol's answer. If you are using rabbitmq you can use the rabbitmqctl command to list the queue details and compare those settings with the settings in your own code. Hopefully that gives you enough information to detect the conflict.