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From "Timothy Bish (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-4595) QueueBrowser hangs when browsing large queues
Date Fri, 12 Jul 2013 19:25:48 GMT

    [ https://issues.apache.org/jira/browse/AMQ-4595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13707283#comment-13707283
] 

Timothy Bish commented on AMQ-4595:
-----------------------------------

I think the simplest fix right now short of rewriting the Queue Browser code to have its own
message cursor implementation is to just give each QueueBrowserSubscription it's own unbounded
duplicate tracker so that we just let them browse until MemoryUsage limits are reached.  
                
> QueueBrowser hangs when browsing large queues
> ---------------------------------------------
>
>                 Key: AMQ-4595
>                 URL: https://issues.apache.org/jira/browse/AMQ-4595
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.8.0
>         Environment: All
>            Reporter: Nicholas Rahn
>            Priority: Critical
>              Labels: QueueBrowser
>         Attachments: AMQ4595Test.java, AMQ580BrowsingBug.java, amq-test-20130621T155120.log
>
>
> When trying to browse a queue with a QueueBrowser, the browsing will hang and never complete.
This appears to happen only with "a lot" of message in the queue. 1000 messages works correctly,
but 10000 hangs.
> I have attached a unit test that exhibits the problem. Change the "messageToSend" variable
in the test method to see the difference between small queue size and large queue size. 
> I've attached the unit test code as well as the output from one of the runs with 10000
messages. 

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