We're running a 9 node 3.7.3 cluster on Ubuntu 14.04 with a variety of clients. 
This is a highly utilized cluster and we'd like to upgrade it to 3.7.17. We 
want to do this with 0 downtime if possible which means we'll want to do a 
rolling upgrade. Is such a thing possible and are there any gotchas when doing 
it? Would we want to upgrade the clients first or the nodes if we can do it in 
a rolling fashion.

Thank You
Sincerely
Garrett Page

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