RabbitMQ在EC2上消耗CPU数量 [英] RabbitMQ on EC2 Consuming Tons of CPU

问题描述

我试图让RabbitMQ与Celery和Django进行EC2实例做一些相当基本的后台处理。我在一个大的EC2实例上运行rabbitmq-server 2.5.0。

我根据说明书下载并安装了测试客户端

旧的结果不会自动清除，所以你必须确保消耗结果，否则队列数将最终失去控制。如果您正在运行RabbitMQ 2.1.1或更高版本，您可以利用x-expires参数来排队队列，这些参数在未使用某个时间限制后将会过期队列。可以通过CELERY_AMQP_TASK_RESULT_EXPIRES设置（未默认启用）来设置队列过期（以秒为单位）。

I am trying to get RabbitMQ with Celery and Django going on an EC2 instance to do some pretty basic background processing. I'm running rabbitmq-server 2.5.0 on a large EC2 instance.

I downloaded and installed the test client per the instructions here (at the very bottom of the page). I have been just letting the test script go and am getting the expected output:

recving rate: 2350 msg/s, min/avg/max latency: 588078478/588352905/588588968 microseconds
recving rate: 1844 msg/s, min/avg/max latency: 588589350/588845737/589195341 microseconds
recving rate: 1562 msg/s, min/avg/max latency: 589182735/589571192/589959071 microseconds
recving rate: 2080 msg/s, min/avg/max latency: 589959557/590284302/590679611 microseconds

The problem is that it is consuming an incredible amount of CPU:

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
668 rabbitmq 20 0 618m 506m 2340 S 166 6.8 2:31.53 beam.smp
1301 ubuntu 20 0 2142m 90m 9128 S 17 1.2 0:24.75 java

I was testing on a micro instance earlier and it was completely consuming all resources on the instance.

Is this to be expected? Am I doing something wrong?

Thanks.

Edit:

The real reason for this post was that celerybeat seemed to run okay for awhile and then suddenly consume all resources on the system. I installed the rabbitmq management tools and have been investigating how the queues are created from celery and from the rabbitmq test suite. It seems to me that celery is orphaning these queues and they are not going away.

Here is the queue as generated by the test suite. One queue is created and all the messages go into it and come out:

Celerybeat creates a new queue for every time it runs the task:

It sets the auto-delete parameter to true, but I'm not entirely sure when these queues will get deleted. They seem to just slowly build up and eat resources.

Does anyone have an idea?

Thanks.

解决方案

Ok, I figured it out.

Here's the relevant piece of documentation: http://readthedocs.org/docs/celery/latest/userguide/tasks.html#amqp-result-backend

Old results will not be cleaned automatically, so you must make sure to consume the results or else the number of queues will eventually go out of control. If you’re running RabbitMQ 2.1.1 or higher you can take advantage of the x-expires argument to queues, which will expire queues after a certain time limit after they are unused. The queue expiry can be set (in seconds) by the CELERY_AMQP_TASK_RESULT_EXPIRES setting (not enabled by default).

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