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https://issues.apache.org/jira/browse/QPID-3720?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rob Godfrey updated QPID-3720:
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Status: Ready To Review (was: In Progress)
> [Java Broker] Implement Message Grouping
> ----------------------------------------
>
> Key: QPID-3720
> URL: https://issues.apache.org/jira/browse/QPID-3720
> Project: Qpid
> Issue Type: Improvement
> Components: Java Broker
> Reporter: Rob Godfrey
> Assignee: Rob Godfrey
> Original Estimate: 6h
> Time Spent: 6h
> Remaining Estimate: 0h
>
> Implement message grouping on the Java Broker (similar in style to that
> implemented in the C++ broker in QPID-3346)
> In contrast to the C++ implementation
> 1) Once a group has been assigned to a subscription, assign all further
> messages from the same group to the same group (whether or not all prior
> messages in the group have been acknowledged)
> 2) Message grouping is allowed on priority queues, Conflation Queues (and
> Sorted Queues). (However it has no effect on browsers... which means if you
> using a ConflationQueue as an LVQ by browsing it you cannot use groups).
> 3) Allow for non string values for the group header
> 4) Setting the qpid.shared_msg_group argument is not required on queue
> construction (whether grouping is enforced or not depends on whether the
> qpid.group_header_key argument is non-null).
> Note that in general 1) is stricter than the condition that is enforced by
> the C++ broker - however in the case where a client cancels a subscription
> without first releasing/acknowledging all outstanding messages that have been
> delivered then you can get "out of order".
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