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Posted to dev@qpid.apache.org by "Gordon Sim (JIRA)" <qp...@incubator.apache.org> on 2010/02/01 18:42:19 UTC
[jira] Commented: (QPID-2380) define and implement reliability
options for senders and receivers
[ https://issues.apache.org/jira/browse/QPID-2380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12828192#action_12828192 ]
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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