I wonder if multinode cluster has any limitations with geographical localization of nodes (mainly master). Is it possible (and efficient) to install 3 master nodes in e.g London, NY and Sydney respectively and connect them to 1 cluster? Is it any limitations for such approach, e.g in licenses or something else?
Also add to it several data nodes - is it important where they are? I think that they should be "close" to master node but I'd like to be sure.