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Subject: [OASIS Issue Tracker] Commented: (MQTT-74) What should happen to messages pending delivery once the client sends unsubscribe?
[ http://tools.oasis-open.org/issues/browse/MQTT-74?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=35192#action_35192 ] Raphael Cohen commented on MQTT-74: ----------------------------------- OK, so to clarify I would:- - change 'process' to deliver - Add that a client that receives a message for a topic to which it is not currently subscribed MAY choose to discard the message => there's an impact here on QoS 1/2 handling for naive clients, but so be it Add some non-normative text explaining the rationale of the final sentence, to make it clear that this might be for a few messages / only for the immediate future (ie not forever). > What should happen to messages pending delivery once the client sends unsubscribe? > ---------------------------------------------------------------------------------- > > Key: MQTT-74 > URL: http://tools.oasis-open.org/issues/browse/MQTT-74 > Project: OASIS Message Queuing Telemetry Transport (MQTT) TC > Issue Type: Improvement > Components: core > Affects Versions: 3.1.1 > Reporter: Richard Coppen > Fix For: 3.1.1 > > > A client might be too busy to process any more work, so sends UNSUBSCRIBE to turn the flow off. > Alternatively, the client may be unaware that a backlog of messages exists and sends UNSUBSCRIBE. > There are at lesat three possible options: > 1. The server delays sending the UNSUBACK until the backlog is cleared > 2. Send the UNSUBACK and then send the messages > 3. Send the UNSUBACK and then purge the messages > The client's last defense should it not want the messages is to disconnect and reconnect with cleanSession set to (1) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://tools.oasis-open.org/issues/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
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