Cluster Management - Big Data Made Easy: A Working Guide to the Complete Hadoop Toolset - page 227

Figure 8-1. Ambari server registration
I click Next to access the Assign Master window. I keep the default settings here, because the Name Node server
was set as hc2nn and components like Oozie are on a different server, which is hc2r1m1. I click Next again to set up
the slaves and clients. As shown in Figure 8-2 , this window defines which servers will be data nodes, node managers,
and region servers, and so on. For my configuration, all of the non-Name Node (hc2nn) machines are set as data
nodes and they all have clients.