[OASIS Issue Tracker] Created: (MQTT-14) Tighten up language in Quality of Service levels and flows

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

Tighten up language in Quality of Service levels and flows 
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                 Key: MQTT-14
                 URL: http://tools.oasis-open.org/issues/browse/MQTT-14
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Improvement
          Components: edits
            Reporter: Rahul Gupta
            Assignee: Rahul Gupta
            Priority: Minor


It was today reported in MQTT google group. https://mail.google.com/mail/?shva=1#inbox/13ec114a841305d9

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The spec explains (http://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#qos-flows) that when a message is published to the server with qos 1 the server should persist it, deliver it to all subscribers, delete the message and then puback.

Does this require the server to wait for puback from all subscribers which subscribed with qos1 before sending puback to the original publisher? What about disconnected qos1 subscribers, are they exempted?

My concern is that the pub/puback takes a whole lot longer in this case, without any extra reliability benefits. Couldn't the server send puback as soon as the message is persisted? 
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Language in specification needs to be tightened up








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