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https://issues.apache.org/jira/browse/QPID-2380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12828192#action_12828192
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Gordon Sim commented on QPID-2380:
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>From doxygen for c++ client at present:
reliability - indicates the level of reliability that the receiver expects.
Can be one of unreliable, at-most-once, at-least-once or exactly-once (the
latter is not yet correctly supported)
unreliable and at-most-once are currently treated as the same and for a
receiver they will mean that accept-mode=none is used (for 0-10) and in the
case of receiving from an exchange an auto-deleted subscription queue is used
meaning that messages can be missed during failover or otherwise when not
connected. For senders these mean that an outgoing message is no longer
considered pending when it has been written to the wire (regardless of whether
the broker has yet received it) [Note: in the current c++ client impl this is
not possible and a temporary workaround will be put in place]
at-least-once uses accept-mode=explicit (0-10) for receivers and a queue that
is not deleted when the session is lost for topic receivers; for senders it
results in a replay buffer being maintained and messages replayed when a
disconnected connection is reconnected (e.g. on failover).
> define and implement reliability options for senders and receivers
> ------------------------------------------------------------------
>
> Key: QPID-2380
> URL: https://issues.apache.org/jira/browse/QPID-2380
> Project: Qpid
> Issue Type: Improvement
> Components: C++ Client, Python Client
> Affects Versions: 0.6
> Reporter: Gordon Sim
> Assignee: Rafael H. Schloming
>
> c++ client currently only recognises 'reliability' option for receivers
> (unreliable and at-most-once are handled by no-acks and by auto-deleting temp
> subscription queues on failover)
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