What if you had two instances of your service running and had a way to individually control the starting/stopping of each one? If you did this, you could shut down service A, change whatever you want, bring up service A, and then do the same for B. The "stop" command would really be a quiesce, allowing currently connected users to stay connected, but new requests would go to the other service. Once all the currently connected users disconnect, the service shuts down and you can do your work. This assumes that user sessions are relatively short-lived.
thor
The only easy day was yesterday
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