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https://issues.apache.org/jira/browse/DISPATCH-630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15853918#comment-15853918
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Rob Godfrey commented on DISPATCH-630:
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{quote}
No I didn't, and you know it I'd say "properly" is different from my outlined
'at all' scenario, and in the case I described the client would at least know
what it could or could not expect from the server.
{quote}
;-) sure, but in the case of the JMS client, does it actually help at all to
know that the server isn't implementing it - you can't actually communicate
this to the application in any way other than having a "strict JMS" type flag
which will fail the connection on startup (which again isn't terribly helpful).
What I'm going for is something that if your system is designed "correctly"
(i.e. your clients actually have unique ids, and thus a duplicate connection is
probably some sort of transient issue as processes are being brought up and
down) then the system works "as expected".
> Detecting connections with the same container-id
> ------------------------------------------------
>
> Key: DISPATCH-630
> URL: https://issues.apache.org/jira/browse/DISPATCH-630
> Project: Qpid Dispatch
> Issue Type: Improvement
> Reporter: Paolo Patierno
> Priority: Minor
>
> Using the router in the EnMasse project and looking into the MQTT
> specification we have the following problem on the current EnMasse
> implemetation.
> The MQTT specification says the following ...
> Let's imagine that a client is connected to the broker with client id "1234"
> and that another client tries to connect with same client id. The broker will
> shut down the connection with first client opening the new one.
> Now with our MQTT support, the MQTT gateway can run as multiple instances
> (multiple pods) so this check can't be executed by the gateway locally
> because a client "1234" could connect to MQTT GW-1 and another client (always
> "1234") could connect to the MQTT GW-2 and the gateways don't know about each
> other. The common point they have is the router network inside EnMasse and
> the fact that for each MQTT client a new AMQP connection is created on the
> other side attaching a link with this name : $mqtt.to.<client-id>
> The following idea came ...
> If during the connection we use a container-id that is equals to the
> client-id, could the router have a feature for detecting connections with
> same container-id and providing a way to close the previous ones ?
> It should be an information shared (and cached ?) by routers in their
> inter-router protocol.
> If not at connection level, maybe at link attachment level ? (when two
> clients attach to the same $mqtt.to.<client-id> link)
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