Topic slow consumer message discarding broken
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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
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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