I probably should have said that it "can" run on any node. Yes, currently it does run on every node, but their roadmap doesn't have the requirement that every node be actively participating in elections.
I'm sure that you have seen fleets of dedicated Zookeeper nodes. I rather like that etcd is simply a service that can run on any node, and does not require a separate role-specific fleet of servers just to do coordination. That was the point I was attempting to make.
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I probably should have said that it "can" run on any node. Yes, currently it does run on every node, but their roadmap doesn't have the requirement that every node be actively participating in elections.
I'm sure that you have seen fleets of dedicated Zookeeper nodes. I rather like that etcd is simply a service that can run on any node, and does not require a separate role-specific fleet of servers just to do coordination. That was the point I was attempting to make.