Reusing subscriptions best practice

Is the best way to ensure that a client has only one active subscription 
to a topic to specify the same kn_id when subscribing? 
The problem I want to address is that, if I restart my (Java) client w/o 
restarting the pubsub (Python) server, I receive multiple event 
notifications for the same event. If I add a specific kn_id when 
subscribing then there is only one notification as desired. Is this the 
*best* practice for solving this problem?

Robert



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