if (libmemcached_util_ping2(hostname, port, opt_username, opt_passwd, &instance_rc) == false)
{
std::cerr << "Failed to ping " << hostname << ":" << port << " " << memcached_strerror(NULL, instance_rc) << std::endl;
if (libmemcached_util_ping2(hostname, port, opt_username, opt_passwd, &instance_rc) == false)
{
std::cerr << "Failed to ping " << hostname << ":" << port << " " << memcached_strerror(NULL, instance_rc) << std::endl;