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https://issues.apache.org/jira/browse/AMQ-1853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13072223#comment-13072223
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Farhad Dehghani commented on AMQ-1853:
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As long as camel uses activemq as the underlying messaging system, then it may
necessarily have the same issue. You may be able to spawn a new thread to
handle consumption or redelivery of a message, but my guess is that the
original consumer thread would somehow remain blocked until activemq get
exhausted to retry according to the redelivery policy. Please correct me if I'm
wrong.
I have tried this with spring-integration, by setting the "concurrentConsumers"
on the jms-listener container up to a higher value than 1, and I succeed to
continue picking messages from the queue, but the original consumer remains
blocked.
> Optional non-blocking redelivery
> --------------------------------
>
> Key: AMQ-1853
> URL: https://issues.apache.org/jira/browse/AMQ-1853
> Project: ActiveMQ
> Issue Type: Wish
> Components: Broker
> Affects Versions: 5.1.0
> Reporter: Demian Mrakovich
> Fix For: 5.6.0
>
>
> When a message is redelivered the consumer blocks for the amount of time
> specified by the redelivery delay. For a high load scenario where message
> order is irrelevant this is just reducing performance and will result in a
> complete halt if the delay is long and several bad messages are consumed in a
> short time.
> I think what I basically wish for is how it worked in versions 3.x, prior to
> fix for AMQ-268. So I would very much like to have configurable option to NOT
> block consumers when redelivering messages.
> If no-one feels up to it, I'd still appreciate some hints and I could try to
> fix it myself. Looking at ActiveMQMessageConsumer.rollback(), I was thinking
> something in the lines of just scheduling a task to put the message back on
> queue after a delay - if configured to, instead of stopping delivery and a
> schedule a task to resume delivery again. But I do not possess an
> understanding of AMQ thorough enough to predict potential side effects of
> this, so any analysis would be helpful.
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