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https://issues.apache.org/activemq/browse/AMQ-2017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rob Davies updated AMQ-2017:
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Fix Version/s: 5.4.0
> Topic slow consumer message discarding broken
> ---------------------------------------------
>
> Key: AMQ-2017
> URL: https://issues.apache.org/activemq/browse/AMQ-2017
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.2.0
> Reporter: Teemu Torma
> Fix For: 5.4.0
>
>
> TopicSubscription class misbehaves when dispatching matched messages after
> the first message has been discarded. The problem is that difference between
> dispatch and dequeue counters is used to determine if the dispatch queue is
> full, but discarding messages also increments dequeue counter, breaking the
> dispatching logic. Effectively every other message is dispatched anyway to
> the consumer side.
> The mismatch in counting can also be observed in jconsole; the topic
> dispatched queue size starts ticking down for every discarded message.
> A quick test shows that not incrementing dequeue counter in discard method
> fixes this problem, but I don't know if it has any other side effects.
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