[rabbitmq-discuss] checking no of message in queue
emile at rabbitmq.com
Tue Mar 22 09:43:42 GMT 2011
Op 22/03/2011 09:01, het cheepu geskryf:
> I am checking the number of message in the queue.
> I am using the fillowing code for this.
> channel.exchangeDeclare("exchange", "direct",true);
> I am using the same connection object. but the channel for both task is
> I started two thread( consumer thread to consume msg from queue and a thread
> to check no of message in queue) which are running continuously but I can
> pause and stop the consumer thread.
> I did the following steps:
> 1. Produced 20 message
> Result: queue depth is 0 because all the messages are consumed by the
> consumer thread
> This is expected result.
> 2. Next I paused the consumer thread. and then again produced 20 message.
> Result: queue depth is 0( This is unexpected because there are 20 messages
> in queue) and message is not consumed by the consumer thread( because they
> are paused ).
> 3. Next I stopped the consumer:
> Result: Now I am getting the no of message in the queue ie 20.
> Why when the consumer is sleeping then my queue size ( ie message in queue)
> is zero?
This could happen if you are using the QueueingConsumer in auto-ack
mode, because the the QueueingConsumer will accept messages from the
broker and store them in memory on the client. You don't say exactly
what the consumer thread does - if it just dequeues messages from the
QueueingConsumer then that is a possible explanation for your observations.
You can use the following command before and after each of your 3 steps
rabbitmqctl list_queues name messages messages_ready messages_unacknowledged
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