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https://issues.apache.org/jira/browse/AMQ-6824?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary Tully resolved AMQ-6824.
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Resolution: Fixed
> PrefetchExtension growth with transacted consumers
> --------------------------------------------------
>
> Key: AMQ-6824
> URL: https://issues.apache.org/jira/browse/AMQ-6824
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.15.0
> Reporter: Gary Tully
> Assignee: Gary Tully
> Fix For: 5.16.0
>
>
> With a transacted consumer on either a topic or queue the prefetch extension
> increments only. This leads to flow control failing b/c the subscription is
> never full. Messages can accumulate on the subscription dispatch channel if
> the consumer is blocked or slow. As a result, memory usage limits can be
> exceeded for topics.
> There is a similar issue with client_ack mode and prefetch.
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