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Subject: [OASIS Issue Tracker] (MQTT-260) Add a CONNACK code of 'Try Another Server'


    [ https://issues.oasis-open.org/browse/MQTT-260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=63815#comment-63815 ] 

Ken Borgendale commented on MQTT-260:
-------------------------------------

While editing this support I came across another product which does a similar thing by using the semicolon as the host to port separator.  This would allow a slightly simpler parse at the cost of being slightly less common with other representation of the authority.  If there is any desire to do this, we could write another issue and change this.

> Add a CONNACK code of 'Try Another Server'
> ------------------------------------------
>
>                 Key: MQTT-260
>                 URL: https://issues.oasis-open.org/browse/MQTT-260
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 5
>            Reporter: Raphael Cohn
>            Assignee: Ken Borgendale
>            Priority: Critical
>             Fix For: wd08
>
>
> If we add a CONNACK return code of 'Try Another Server', this makes it easier for over-loaded servers to tell clients to redirect. This works in conjunction with MQTT-259, which advocates the use of DNS SRV records.
> Indeed, if we also added server-originated DISCONNECT packets with this return code, we could get clients to cleanly migrate to another server when a server is shutdown for maintenance.
> Please note, I do not favour the server also reporting which new server to connect to. There in lies the route to madness, as it means the current server has to know the state of all the others. That's intimate knowledge.



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