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https://issues.apache.org/jira/browse/QPID-5496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13876862#comment-13876862
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Robbie Gemmell commented on QPID-5496:
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Proposal for this is that the existing default behaviour is retained (i.e. no
default group in regular mode, 'qpid.no-group' as the default group in shared
mode), with the new behaviour being explicitly requested via new usage of the
existing "qpid.default-group" argument (and its Java broker equivalent
"messageGroupDefaultGroup") when creating the queue. Setting a value in this
argument would then cause the 'regular' grouping mode to enable a default group
for messages without a value of their own, rather than being ignored as
previously. Explicitly setting the argument to null or "qpid.no-default-group"
will be taken to mean disabling of the default group for either grouping mode.
> [Java Broker] allow adding a default group for 'regular groups' and allow
> removing the default group when using 'shared groups'
> -------------------------------------------------------------------------------------------------------------------------------
>
> Key: QPID-5496
> URL: https://issues.apache.org/jira/browse/QPID-5496
> Project: Qpid
> Issue Type: Improvement
> Components: Java Broker
> Reporter: Robbie Gemmell
> Assignee: Robbie Gemmell
> Fix For: Future
>
>
> The Java broker currently supports two types of message grouping:
> - A 'regular' mode where groups are assigned to consumers for the life of the
> consumer, and messages without a group value are treated as not having a
> group.
> - A 'shared groups' mode that operates like the C++ broker grouping whereby
> groups can float between consumers when no consumer currently has any
> unacknowledged messages for the group, and any messages without a group value
> are assigned to a default group (qpid.no-group unless configured otherwise)
> which cant be disabled.
> This enhancement would add the ability to set a default group for the
> 'regular' grouping mode, and add the ability to remove the default group from
> the 'shared groups' mode.
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