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https://issues.apache.org/activemq/browse/AMQ-1859?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dejan Bosanac resolved AMQ-1859.
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Resolution: Fixed
Fix committed to SVN revision 748204.
> Race condition when browsing a queue with active Producers / Consumers
> ----------------------------------------------------------------------
>
> Key: AMQ-1859
> URL: https://issues.apache.org/activemq/browse/AMQ-1859
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.1.0
> Environment: Windows XP Professional, SP2
> Reporter: Anthony Enache
> Assignee: Dejan Bosanac
> Fix For: 5.3.0
>
> Attachments: QueueBrowserTest.java
>
>
> Browsing a queue aggressively ( ie repeatedly with high frequency ) that is
> also experiencing message production and consumption results in some messages
> failing to be delivered to pre-registered consumers. Messages are visible on
> the queue to new consumers, but not pre-existing ones.
> I've attached a junit test case that show this behaviour. Note that since
> this is a race condition, it manifests sporadically. You may need to run the
> test a few times before it fails.
> The interesting bit is the method testProducerBrowserConsumer(). This sets
> up a couple of message producers, a message consumer, and a message browser
> on the same queue. The producers send a known number of messages on the
> queue while the browsers creates a number of queue browsers and iterates
> through the contents. The consumer pulls messages from the queue using a
> receive method set to time out after 30 sec. Once the consumer exits, we
> start a cleanup consumer to process any remaining messages on the queue.
> There should be zero messages outstanding. This is often not the case. I've
> modified the test case, originally, we just asserted that we had received the
> sent number of messages. I added the cleanup receiver to demonstrate that
> new consumers on the queue can see messages that pre-existing ones do not.
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