billpoole-mi commented on issue #2548: ARTEMIS-2118 Enhanced Message Groups Support URL: https://github.com/apache/activemq-artemis/pull/2548#issuecomment-463025385 I have a couple of questions regarding the "support rebalancing groups when a consumer is added" aspect of this change: - When a message group X is rebalanced from consumer A to consumer B, how will consumer A be informed that it is no longer assigned message group X and shouldn't expect any further messages in that message group? Will Artemis send the consumer a message, perhaps with JMSXGroupSeq = -1, or perhaps some kind of special header like JMSXGroupLastForConsumer? - Can consumer A release possession of the messages in message group X that consumer A is still processing (i.e. hasn't yet acknowledged) by acknowledging those messages as "released" (as opposed to accepted/rejected), such that those messages are then resent by Artemis to consumer B?
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