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Subject: [OASIS Issue Tracker] Updated: (MQTT-18) Clarifying what MQTT means by storing data.

     [ http://tools.oasis-open.org/issues/browse/MQTT-18?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Banks updated MQTT-18:

    Fix Version/s: 3.1.1

> Clarifying what MQTT means by storing data.
> -------------------------------------------
>                 Key: MQTT-18
>                 URL: http://tools.oasis-open.org/issues/browse/MQTT-18
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: core
>            Reporter: Andrew Banks
>            Assignee: Andrew Banks
>             Fix For: 3.1.1
> The MQTT Specification talks about storing state for example in terms of durable subscriptions, retained [publications and partially completed message transfers for Qos 1 and Qos 2.
> In practice server  implementations interpret storing state in a number of ways ranging from a forced write to a disk to keeping the data in volatile memory which
> is cleared if the server is restarted. This is also the case for the client implementation, though most of these seem to actually force the data to disk.
> The consequence of not storing data by forcing it to disk  in the server are:
> Loss of retained publications, loss of durable subscriptions, loss of Qos =1 publications, loss or duplication of Qos=2 publications
> In the client this would also result in loss or duplication of messages.
> The client and server are only able to detect  indirectly that the other has lost data, for example by failing to receive a retained publication.

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