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Subject: [OASIS Issue Tracker] Created: (MQTT-18) Clarifying what MQTT means by storing data.
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 Reporter: 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. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://tools.oasis-open.org/issues/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
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