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https://issues.apache.org/activemq/browse/AMQ-2780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=60116#action_60116
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Rob Davies commented on AMQ-2780:
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do the order violations happen around the time the delay ?
> ActiveMQ not preserving Message Order
> -------------------------------------
>
> Key: AMQ-2780
> URL: https://issues.apache.org/activemq/browse/AMQ-2780
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 5.3.0
> Environment: Windows XP, JDK 1.6.0_07
> Reporter: Ryan Rolland
> Assignee: Rob Davies
> Priority: Critical
> Fix For: 5.4.0
>
> Attachments: BenchmarkSupport.java, Consumer.java, Producer.java
>
>
> I believe I have found a bug in message order delivery in ActiveMQ. I have
> taken the example benchmark consumer and producer programs and made the
> following modifications:
> 1) Added a counter to keep track manually of the message order.
> 2) Made the transmitted number of bytes per message random between 1 and
> 64 bytes.
> 3) Added a random delay between 1 and 10 seconds triggered after every
> 100000 messages transferred on the publishing side.
> After running for a few minutes I begin to see violations in the message
> delivery order. In my most recent run I have counted 54 violations over the
> course of an hour.
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