code: public static String infoAll(AerospikeClient client, String cmd) {
  		Node[] nodes = client.getNodes();
  		StringBuilder results = new StringBuilder();
  		for (Node node : nodes) {
  			results.append(Info.request(node.getHost().name, node.getHost().port, cmd)).append("\n");
  		}
  		return results.toString();
  	}
docs: Sends an "Info" command to all nodes in the cluster
  
  @param client AerospikeClient instance
  @param cmd	Info command to be sent to the cluster
  @return A string containing the results from all nodes in the cluster