public function __construct($configName)
 {
     parent::__construct($configName);
     $this->memcache->setOption(Memcached::OPT_BINARY_PROTOCOL, true);
     $this->memcache->setOption(Memcached::OPT_NO_BLOCK, true);
     $this->memcache->setOption(Memcached::OPT_AUTO_EJECT_HOSTS, true);
     $this->memcache->setOption(Memcached::OPT_CONNECT_TIMEOUT, 2000);
     $this->memcache->setOption(Memcached::OPT_POLL_TIMEOUT, 2000);
     $this->memcache->setOption(Memcached::OPT_RETRY_TIMEOUT, 2);
     $this->memcache->setSaslAuthData(getenv('MEMCACHIER_USERNAME'), getenv('MEMCACHIER_PASSWORD'));
 }