Creating two consumers one after the other causes problems dequeuing messages
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Key: AMQ-1961
URL: https://issues.apache.org/activemq/browse/AMQ-1961
Project: ActiveMQ
Issue Type: Bug
Affects Versions: 5.1.0
Reporter: Aaron Pieper
Attachments: EnqueueDequeueBug.java
I create a vm queue with ten messages. I then create a consumer, dequeue the
top message (message #1), and close that consumer. If I then create a second
consumer, and try to dequeue the top message (message #2), there is a small
chance that this will unexpectedly fail, and the request will time out. This is
one problem.
After this happens, examining the queue with a queue browser shows message #2
still on the queue. However, subsequent attempts to dequeue this message will
always time out. Messages #3-10 will be in the same state; they will still be
in the queue, but they cannot be dequeued. This is a worse problem, as it means
that we can not reuse this queue.
The problem arises more frequently as there are more consumers. With two or
three consumers, it comes up sporadically. With twenty or more consumers, it
happens almost 100% of the time. I've attached a test case which demonstrates
the bug consistenty.
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