Scheduled Messages
Currently, Ordering group doesn't suppport scheduled messages. Although technically
possible, in practical use these two features shouldn't be used together. Because in
some sense they are functionally conflict. Using scheduled delivery meaning you want each
of such messages delivered at certain point of time in future, namely those messages must
be delivered in the order determined by their scheduled times. On the other hand ordering
group requires messages to be delivered in the order of sent sequence.
DLQ/ExpiryQueue
If a message of an ordering group is 'dead' or expired, it goes to the
corresponding DLQ or ExpiryQueue and the message will be ACKed. Ordering Groups treat
those messages are correctly delivered and completed when controling the ordering group
delivery. Therefore, the consumers would see some message 'hole's during the
receiving of ordering group messages. The 'hole's won't prevent their
succeeding messages from delivering.
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