尝试使用Celery + RabbitMQ设置优先级队列时，出现“ PreconditionFailed-队列的等价arg'x-max-priority'”错误

问题描述

我有RabbitMQ设置，带有两个队列：low和high。我希望我的芹菜工人在消耗低优先级队列的任务之前先从高优先级队列中进行消耗。尝试将消息推送到RabbitMQ时出现以下错误

>>> import tasks
>>> tasks.high.apply_async()
Traceback (most recent call last):
  File "<stdin>",line 1,in <module>
  File "/home/vagrant/.local/lib/python3.6/site-packages/celery/app/task.py",line 570,in apply_async
    **options
  File "/home/vagrant/.local/lib/python3.6/site-packages/celery/app/base.py",line 756,in send_task
    amqp.send_task_message(P,name,message,**options)
  File "/home/vagrant/.local/lib/python3.6/site-packages/celery/app/amqp.py",line 552,in send_task_message
    **properties
  File "/home/vagrant/.local/lib/python3.6/site-packages/kombu/messaging.py",line 181,in publish
    exchange_name,declare,File "/home/vagrant/.local/lib/python3.6/site-packages/kombu/connection.py",line 510,in _ensured
    return fun(*args,**kwargs)
  File "/home/vagrant/.local/lib/python3.6/site-packages/kombu/messaging.py",line 194,in _publish
    [maybe_declare(entity) for entity in declare]
  File "/home/vagrant/.local/lib/python3.6/site-packages/kombu/messaging.py",in <listcomp>
    [maybe_declare(entity) for entity in declare]
  File "/home/vagrant/.local/lib/python3.6/site-packages/kombu/messaging.py",line 102,in maybe_declare
    return maybe_declare(entity,self.channel,retry,**retry_policy)
  File "/home/vagrant/.local/lib/python3.6/site-packages/kombu/common.py",line 121,in maybe_declare
    return _maybe_declare(entity,channel)
  File "/home/vagrant/.local/lib/python3.6/site-packages/kombu/common.py",line 145,in _maybe_declare
    entity.declare(channel=channel)
  File "/home/vagrant/.local/lib/python3.6/site-packages/kombu/entity.py",line 609,in declare
    self._create_queue(nowait=nowait,channel=channel)
  File "/home/vagrant/.local/lib/python3.6/site-packages/kombu/entity.py",line 618,in _create_queue
    self.queue_declare(nowait=nowait,passive=False,line 653,in queue_declare
    nowait=nowait,File "/home/vagrant/.local/lib/python3.6/site-packages/amqp/channel.py",line 1154,in queue_declare
    spec.Queue.DeclareOk,returns_tuple=True,File "/home/vagrant/.local/lib/python3.6/site-packages/amqp/abstract_channel.py",line 80,in wait
    self.connection.drain_events(timeout=timeout)
  File "/home/vagrant/.local/lib/python3.6/site-packages/amqp/connection.py",line 500,in drain_events
    while not self.blocking_read(timeout):
  File "/home/vagrant/.local/lib/python3.6/site-packages/amqp/connection.py",line 506,in blocking_read
    return self.on_inbound_frame(frame)
  File "/home/vagrant/.local/lib/python3.6/site-packages/amqp/method_framing.py",line 55,in on_frame
    callback(channel,method_sig,buf,None)
  File "/home/vagrant/.local/lib/python3.6/site-packages/amqp/connection.py",in on_inbound_method
    method_sig,payload,content,line 126,in dispatch_method
    listener(*args)
  File "/home/vagrant/.local/lib/python3.6/site-packages/amqp/channel.py",line 282,in _on_close
    reply_code,reply_text,(class_id,method_id),ChannelError,amqp.exceptions.PreconditionFailed: Queue.declare: (406) PRECONDITION_FAILED - inequivalent arg 'x-max-priority' for queue 'high' in vhost '/': received none but current is the value '10' of type 'signedint'

这是我的芹菜配置

import ssl
broker_url="amqps://"
result_backend="amqp://"
include=["tasks"]
task_acks_late=True
task_default_rate_limit="150/m"
task_time_limit=300
worker_prefetch_multiplier=1
worker_max_tasks_per_child=2
timezone="UTC"
broker_use_ssl = {'keyfile': '/usr/local/share/private/my_key.key','certfile': '/usr/local/share/ca-certificates/my_cert.crt','ca_certs': '/usr/local/share/ca-certificates/rootca.crt','cert_reqs': ssl.CERT_REQUIRED,'ssl_version': ssl.PROTOCOL_TLSv1_2}
from kombu import Exchange,Queue
task_default_priority=5
task_queue_max_priority = 10
task_queues = [Queue('high',Exchange('high'),routing_key='high',queue_arguments={'x-max-priority': 10}),]
task_routes = {'tasks.high': {'queue': 'high'}}

我有一个tasks.py脚本，其中定义了以下任务

from __future__ import absolute_import,unicode_literals
from celery_app import celery_app

@celery_app.task
def low(queue='low'):
    print("Low Priority")

@celery_app.task(queue='high')
def high():
    print("HIGH PRIORITY")

还有我的celery_app.py脚本：

from __future__ import absolute_import,unicode_literals
from celery import Celery
from celery_once import QueueOnce
import celeryconfig

celery_app = Celery("test")
if __name__ == '__main__':
    celery_app.start()

我正在使用此命令启动芹菜工人

celery -A celery_app worker -l info --config celeryconfig --concurrency=16 -n "%h:celery" -O fair -Q high,low

我正在使用：

• RabbitMQ：3.7.17
• 芹菜：4.3.0
• Python：3.6.7
• 操作系统：Ubuntu 18.04.3 LTS仿生

解决方法

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