/**
* Build an execable that will execute the command.
*/
public static Execable buildExecable() {
return new Execable() {
@Override
public void exec(String[] args) throws MasterExecException, IOException {
Preconditions.checkArgument(args.length == 2, "Usage: physicalNode logicalNode");
String physical = args[0];
String logical = args[1];