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https://issues.apache.org/activemq/browse/AMQ-1853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=48164#action_48164
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John Miller commented on AMQ-1853:
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I have the same problem. When a message listener throws a RuntimeException,
ActiveMQ tries to re-deliver the same message according to redelivery policy,
and the rest of the messages are blocked until the message which caused the
exception is redelivered with success or put into the dead letters queue. I
want my messages to be redelivered with initial redelivery delay 10 seconds
with back-off multiplier 3, maximum 2redelivery attempts, exponential back-off
is on. It means that the messages in the queue are blocked for 10+30+90 = 130
seconds !
> Optional non-blocking redelivery
> --------------------------------
>
> Key: AMQ-1853
> URL: https://issues.apache.org/activemq/browse/AMQ-1853
> Project: ActiveMQ
> Issue Type: Wish
> Components: Broker
> Affects Versions: 5.1.0
> Reporter: Demian Mrakovich
> Fix For: 5.3.0
>
>
> 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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