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https://issues.apache.org/activemq/browse/AMQ-2106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=53480#action_53480
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Luis Rojas commented on AMQ-2106:
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There has never been guarantee of message ordering. When there are several
consumers for the same queue, even though messages can be dispatched in order,
it is impossible to tell if they were processed in order by the consumers, as
some of them can be faster than the others. The guarantee of message ordering
happens only when there is just one consumer or, as in this case, message
groups are used, as there will be only one consumer assigned to a specific
group.
In that case, it is safe to send messages to a new consumer (reassigning the
group) after ANY message has been acknowledged by the previous consumer. Even
more, as this will be done under load, maybe there will never be a "last"
message, as new messages may be always arriving.
But nothing happens with this feature so far, which means every time a consumer
crashes, ActiveMQ must be restarted to put the consumer back online :-(, which
means to put offline all consumers !!
> Allow broker to evenly distribute message groups among consumers
> ----------------------------------------------------------------
>
> Key: AMQ-2106
> URL: https://issues.apache.org/activemq/browse/AMQ-2106
> Project: ActiveMQ
> Issue Type: New Feature
> Components: Broker
> Affects Versions: 5.2.0
> Reporter: Dejan Bosanac
> Assignee: Dejan Bosanac
>
> Currently the broker will not reassign message groups if new consumers
> becomes available (or existing ones are removed). We could allow the broker
> to try reassign the message groups when consumers are added/removed so that
> we have a even distribution among consumers.
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