@Override
 public void handleTimeout(AmbariHostsCheckerContext t) {
   LOGGER.error(
       "Operation timed out. Failed to find all '{}' Ambari hosts. Stack: '{}'",
       t.getHostCount(),
       t.getStack().getId());
 }
 @Override
 public String successMessage(AmbariHostsCheckerContext t) {
   return String.format(
       "Ambari client found all %s hosts for stack '%s'", t.getHostCount(), t.getStack().getId());
 }