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From Yi Pan <y...@yahoo-inc.com>
Subject Question regarding to EnqueueCount and ExpiredCount for topic destination
Date Fri, 03 May 2013 16:52:46 GMT
Hi, all,

We have observed the following behavior in the ActiveMQ destination MBean
stats:
While there is no incoming messages to a topic destination, the EnqueueCount
keeps decreasing instead of stay the same.
Further investigation showed that ExpiredCount is increasing at exactly the
same rate as EnqueueCount decreases:
First run to get stats on the particular destination:
    "ExpiredCount": 1503606
    "EnqueueCount": 170303
Second run:
    "ExpiredCount": 1504372
    "EnqueueCount": 169537

Note that ExpiredCount increased by 766 between the two samples and
EnqueueCount decreased by exactly the same amount.

According to the explanation provided by ActiveMQ official web
(http://activemq.apache.org/how-do-i-find-the-size-of-a-queue.html),
EnqueueCount and ExpiredCount are:
Enqueue Count - the total number of messages sent to the queue since the
last restart
Expired Count - the number of messages that were not delivered because they
were expired

We don't see any reason why those two stats are linked in such a way. Can
someone help to provide some explanation?

Thanks!~

-Yi



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