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https://issues.apache.org/jira/browse/AMQ-5340?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vermeulen updated AMQ-5340:
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Attachment: AMQ5340BrowsingPerformanceBug.java
Attached JUnit test that shows the issue. On my machine it runs in 0.7ms when
sending 50 messages using EXPIRE_MESSAGES_PERIOD = 200. With
EXPIRE_MESSAGES_PERIOD = 10000 and otherwise the same settings it runs in
10.5s, with EXPIRE_MESSAGES_PERIOD = 30000 in 30.5s.
> QueueBrowser hangs until accidentally woken by expired messages background job
> ------------------------------------------------------------------------------
>
> Key: AMQ-5340
> URL: https://issues.apache.org/jira/browse/AMQ-5340
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.9.0, 5.10.0
> Reporter: Vermeulen
> Priority: Critical
> Attachments: AMQ5340BrowsingPerformanceBug.java
>
>
> I would expected browsing a queue with only a few messages to not take take a
> long time. Indeed it normally takes only a few ms. in my application. But
> sometimes the ActiveMQQueueBrowser hangs for up to 30 seconds at method
> before returning!!
> When the issue occurs, the loop in hasMoreElements() calls waitForMessage()
> multiple times which times out after 2s at semaphore.wait(2000) without
> receiving any message from the broker. I found that when the broker's
> background job that checks for expired messages runs, the browser happens to
> be woken even if there are no expired messages. So setting the
> expireMessagesPeriod to a low value (e.g. 200ms) is a good workaround for
> this issue, but this is quite brittle because it uses internal broker
> implementation that may not even be related to the issue!
> To reproduce:
> - (this is what I do in my application) create a queue, send a few message
> with an expiration time of 10 seconds and repeatedly browse it until it is
> empty. If I browse the queue after these 10 seconds have passed, the issue
> occurs!
> - I can always reproduce the issue by running AMQ580BrowsingBug from the
> related bug report AMQ-4595: this browsing test seems to always hang. I
> slightly adjusted the test so you can easily change the expired messages
> period and see the runtime differ with that.
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