code: public OvhTask serviceName_node_hostname_role_POST(String serviceName, String hostname, OvhRoleTypeEnum type) throws IOException {
  		String qPath = "/cluster/hadoop/{serviceName}/node/{hostname}/role";
  		StringBuilder sb = path(qPath, serviceName, hostname);
  		HashMap<String, Object>o = new HashMap<String, Object>();
  		addBody(o, "type", type);
  		String resp = exec(qPath, "POST", sb.toString(), o);
  		return convertTo(resp, OvhTask.class);
  	}
docs: Add the Role to the Node
  
  REST: POST /cluster/hadoop/{serviceName}/node/{hostname}/role
  @param type [required] Role name
  @param serviceName [required] The internal name of your cluster
  @param hostname [required] Hostname of the node