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https://issues.apache.org/jira/browse/AMQ-4223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13532524#comment-13532524
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David Johle commented on AMQ-4223:
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It's probably worth noting that this issue may not specifically tied to the
optimizeAcknowledge=true setting. I have seen it happen on occasion even with
that was false, but very rarely.
> Messages being distributed to exclusive consumers!
> --------------------------------------------------
>
> Key: AMQ-4223
> URL: https://issues.apache.org/jira/browse/AMQ-4223
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.7.0
> Environment: RHEL5, Java 1.6
> Reporter: David Johle
> Priority: Minor
>
> Now that AMQ-3664 is out of the way I thought I could turn on
> optimizeAcknowledge back on as long as I gave it some decent timeOut &
> scheduledAckInterval values.
> Well, it turns out the behavior I was seeing still happens, and I think now
> it's clearer that it is something else, just was partially masked by that
> other issue.
> My configuration is a "network of brokers" two brokers with a producer on
> each one, and a consumer on each one. The consumers are set up with
> exclusive=true as their part of my application is an "aggregation" step. I'm
> using the exclusive mode to ensure that only one of them receives all the
> messages, and the other is essentially a standby/backup in case the first one
> is offline.
> When I have optimizeAcknowlege enabled, I see a situation where it is
> distributing (fairly equally, in fact) the messages to both of the consumers.
> When I set that to false, all the messages funnel into the currently active
> consumer as expected.
> I cannot find anything that says these are incompatible features, and cannot
> figure out what it is that causes this behavior.
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