Our "master" node (currently running cldb, tasktracker, webui, jobtracker, nfs, hoststats, and even zookeeper) of an M3 cluster is in need of replacing. Our current plan is migrate the services to an existing node of the cluster. Obviously we will be running configure.sh across the cluster hosts with the new configuration, but I wanted to make sure there was nothing else that needed to be transferred from the old system to the new system (e.g. config or license files) for a successful transfer of roles. Also, is migrating to an existing node the best strategy? We also have the option of dropping in a brand new host and assuming the same IP address as the current master, although that seemed like a riskier approach.