[OASIS Issue Tracker] Updated: (MQTT-10) Should Qos=0 retained messages be persisted in the server?

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

     [ http://tools.oasis-open.org/issues/browse/MQTT-10?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Richard Coppen updated MQTT-10:
-------------------------------

        Fix Version/s: 3.1.1
    Affects Version/s: 3.1.1
             Proposal: 
Retained messages MUST be stored according to the server's capability to store messages as defined in the <new section on QoS and storage>.

Note to editors: non-section considered, however valid use cases exist for Qos 0 retained messages.

  was:Retained messages MUST be stored according to the servers capability to store messages, however a conforming implementation MAY decide to not retain QoS 0 retained messages over server restarts irrespective of how well it stores Qos=1 or Qos=2 messages.


Would an implementation be conformant if you were to ignore always RETAINED for Qos 0
i.e., pub Qos=0, Retained=1

Options:

1. Disconnect immediately
2. accept, but override to Retained=0
3. Assume it means retain for the life-cycle of the publishers connection
4. Assume it means retain for the life-cycle of the publishers session
5. Honour Retain as for Qos 1 or Qos 2 i.e., until catastrophic failure or admin intervention
6. May discard Qos 0 Retained messages at any time even where Qos 1 or Qos 2 messages survive

> Should Qos=0 retained messages be persisted in the server?
> ----------------------------------------------------------
>
>                 Key: MQTT-10
>                 URL: http://tools.oasis-open.org/issues/browse/MQTT-10
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 3.1.1
>         Environment: MQTT server
>            Reporter: Andrew Banks
>             Fix For: 3.1.1
>
>
> The current specification states that :
> Retained messages should be kept over restarts of the server.
> Is this correct even for Qos=0 retained publications?

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