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https://issues.apache.org/jira/browse/QPID-6621?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Keith Wall resolved QPID-6621.
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Resolution: Fixed
> [Java Broker] Slow performance of Shared Groups message grouping on large
> queues
> --------------------------------------------------------------------------------
>
> Key: QPID-6621
> URL: https://issues.apache.org/jira/browse/QPID-6621
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.28, 0.30, 0.32
> Reporter: Rob Godfrey
> Assignee: Rob Godfrey
> Fix For: 6.0 [Java]
>
>
> In shared group mode, when a consumer gets to the point where it has no more
> messages from a group acquired by it, the consumer effectively relinquishes
> control of the group. At this point all messages from the group become
> available to other consumers... which means that if they have gone "past" any
> such messages then then need to be reset.
> Currently this is achieved by iterating over the group and finding the next
> available member of the group, and then making sure the consumers are set to
> before that point.
> However if the queue is large, and the common case is that there are no
> members of the group, then every consumption of a message leads to iterating
> over the whole queue.
> It is preferable to keep a track of which messages consumers may have skipped
> over, and simply to reset them to the least of these values.
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