与Celery和RabbitMQ进行主题交流

Question

我对我的配置应该是什么样的设置主题交换感到困惑.

http://www.rabbitmq.com/tutorials/tutorial-five-python.html

这就是我想要完成的事情:

Task1 -> send to QueueOne and QueueFirehose
Task2 -> sent to QueueTwo and QueueFirehose

然后:

Task1 -> consume from QueueOne
Task2 -> consume from QueueTwo
TaskFirehose -> consume from QueueFirehose

我只希望Task1从QueueOne和Task2使用来从QueueTwo中使用.

现在的问题是,当Task1和2运行时,它们也会耗尽QueueFirehose,而TaskFirehose任务永远不会执行.

我的配置有问题,还是我误解了什么？

CELERY_QUEUES = { 
    "QueueOne": {
        "exchange_type": "topic",
        "binding_key": "pipeline.one",
    },  
    "QueueTwo": {
        "exchange_type": "topic",
        "binding_key": "pipeline.two",
    },  
    "QueueFirehose": {
        "exchange_type": "topic",
        "binding_key": "pipeline.#",
    },  
}

CELERY_ROUTES = {
        "tasks.task1": {
            "queue": 'QueueOne',
            "routing_key": 'pipeline.one',
        },
        "tasks.task2": {
            "queue": 'QueueTwo',
            "routing_key": 'pipeline.two',
        },
        "tasks.firehose": {
            'queue': 'QueueFirehose',
            "routing_key": 'pipeline.#',
        },
}

Answer 1

假设您实际上的意思是这样的：

Task1 -> send to QueueOne
Task2 -> sent to QueueTwo
TaskFirehose -> send to QueueFirehose

然后：

Worker1 -> consume from QueueOne, QueueFirehose
Worker2 -> consume from QueueTwo, QueueFirehose
WorkerFirehose -> consume from QueueFirehose

这可能不完全是您的意思，但我认为它应该涵盖很多场景，希望也涵盖您的场景。像这样的东西应该有效：

# Advanced example starting 10 workers in the background:
#   * Three of the workers processes the images and video queue
#   * Two of the workers processes the data queue with loglevel DEBUG
#   * the rest processes the default' queue.

$ celery multi start 10 -l INFO -Q:1-3 images,video -Q:4,5 data
-Q default -L:4,5 DEBUG

有关更多选项和参考：http://celery.readthedocs.org/en/latest/reference/celery.bin.multi.html

这是直接来自文档的。

我也遇到过类似的情况，但我的处理方式略有不同。我无法将 celery multi 与supervisord 一起使用。因此，我在supervisord 中为每个worker 创建了多个程序。无论如何，工作人员都会处于不同的流程中，因此只需让主管为您处理一切即可。配置文件看起来像：-

; ==================================
; celery worker supervisor example
; ==================================

[program:Worker1]
; Set full path to celery program if using virtualenv
command=celery worker -A proj --loglevel=INFO -Q QueueOne, QueueFirehose

directory=/path/to/project
user=nobody
numprocs=1
stdout_logfile=/var/log/celery/worker1.log
stderr_logfile=/var/log/celery/worker1.log
autostart=true
autorestart=true
startsecs=10

; Need to wait for currently executing tasks to finish at shutdown.
; Increase this if you have very long running tasks.
stopwaitsecs = 600

; When resorting to send SIGKILL to the program to terminate it
; send SIGKILL to its whole process group instead,
; taking care of its children as well.
killasgroup=true

; if rabbitmq is supervised, set its priority higher
; so it starts first
priority=998

同样，对于 Worker2 和 WorkerFirehose，编辑相应的行以进行：

[program:Worker2]
; Set full path to celery program if using virtualenv
command=celery worker -A proj --loglevel=INFO -Q QueueTwo, QueueFirehose

和

[program:WorkerFirehose]
; Set full path to celery program if using virtualenv
command=celery worker -A proj --loglevel=INFO -Q QueueFirehose

将它们全部包含在supervisord.conf 文件中，这样就可以了。