billpoole-mi edited a comment on issue #2548: ARTEMIS-2118 Enhanced Message Groups Support URL: https://github.com/apache/activemq-artemis/pull/2548#issuecomment-463093142 There may be a workable workflow for transferring ownership of a message group, where that workflow is a cooperation between Artemis and the existing consumer assigned for that message group. What if a message group is flagged for rebalancing when the need arises. Then, the next message to arrive in that message group is sent to the existing consumer with a special header that informs the consumer that the message group is being reassigned. That consumer is then expected to "release" all messages it is working on in that message group back to Artemis, which then sends them to the newly assigned consumer for that message group. If no further message turns up, then it's not really a load balancing issue. What do you think?
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