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From Yi Pan <>
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
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
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?



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