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https://issues.apache.org/jira/browse/AMQ-5660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14361127#comment-14361127
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Arthur Naseef commented on AMQ-5660:
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Because of the nature of topics (being a broadcast) dequeue count is a little
tricky. For example, how many times do you count a message consumed by
multiple subscribers? Once after they all have consumed it (and what if one
subscriber drops before acking the message)? Once per subscriber (leading to
dequeue growing faster than enqueue)?
And what about counting dequeue on non-durable subscriptions? For inflight
messages or only acked messages? Messages published to a Topic with no
consumers?
In other words, the meaning of dequeue on a Topic itself is hard to nail down,
and even if it were nailed down, it would be hard to use reliably. Also keep
in mind that ActiveMQ does not store messages on Topics, but instead stores
them on the subscriptions.
Therefore, I find the best method of watching enqueue and dequeue counts for
Topics is looking at individual subscriptions.
> Dequeue count for Topics does not increase for durable subscribers
> ------------------------------------------------------------------
>
> Key: AMQ-5660
> URL: https://issues.apache.org/jira/browse/AMQ-5660
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 5.6.0
> Environment:
> Reporter: Jessy
>
> I upgraded my ActiveMQ from 5.2.1 to 5.6.0.
> I have durable topic subscribers .
> I see the "subcribers" tab in activemqConsole and i find that the these
> subscribers are able to consume the messages from the topic .
> The "subcribers" tab shows up all the counter's correctly - the dispatched
> counter equals enqueue counter and dequeue counters.
> However, When i check the topic's enque and dequeue count in "Topics" tab, I
> see the dequeue count is always zero and not increased ,even thought the
> subcribers are reported to consume them as seen in the "subcribers" tab.
> I did not face this issue with my previous version of ActiveMQ - version
> 5.2.1.
> Version ActiveMQ 5.2.1 works very good in showing up the correct dequeue
> count for durable topic subscribers.
> My subscribers are on different versions of ActiveMQ.
> Please advise the steps that i need to consider get the dequeue counter match
> with the enqueue counter .
> I came accross exactly the same issue on Jira for version 5.8.0. --
> https://issues.apache.org/jira/browse/AMQ-4965
> If this is a bug to be fixed, please help us get a fix for this.
> Thanks
> Jessy
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