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  1. OASIS Message Queuing Telemetry Transport (MQTT) TC
  2. MQTT-427

Message ordering for shared subscriptions

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 5
    • Fix Version/s: 5, wd12
    • Component/s: None
    • Labels:
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    • Proposal:
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      Section 4.6 (Messaging Ordering) has exceptions for shared subs. In particular the conformance clause labelled MQTT-4.6.0-7 in WD11 should not apply to shared subscriptions.

      Section 4.8.2 (Shared Subscriptions) should have clear words that ordering requirements do not apply to these subscriptions (and perhaps have a non-normative example like the one in the description).

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      Section 4.6 (Messaging Ordering) has exceptions for shared subs. In particular the conformance clause labelled MQTT-4 .6.0-7 in WD11 should not apply to shared subscriptions. Section 4.8.2 (Shared Subscriptions) should have clear words that ordering requirements do not apply to these subscriptions (and perhaps have a non-normative example like the one in the description).

      Description

      At the moment, the spec makes no exception for ordering for shared subscriptions. I think the TC has agreed that the ordering requirements do not apply to shared subscriptions but that is not reflected in WD11 as far as I can see.

      (For one example of non-ordering, consider a shared subscription with two clients receiving messages as QoS=1. Client A receives message 1 (but does not ack it). Client B receives messages 2 & 3 and acks them. Client A's session then expires. I think we want servers to be able to deliver message 1 to Client B).

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            • Assignee:
              ken.borgendale Ken Borgendale (Inactive)
              Reporter:
              levell Jonathan Levell
            • Watchers:
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                Updated:
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