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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:
-----------------------------
Assignee: Andrew Banks
> 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
>
> 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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