private function updateExpireTag($tag, $lifetime = null)
    {
        try {
            if (isset($this->_hashmap[$tag])) {
                foreach (array_keys($this->_hashmap[$tag]) as $key) {
                    $value = $this->load($key);
                    if ($value) {
                        $this->save($key, $value, $lifetime, $tag);
                    }
                }

                return true;
            }
        } catch (\Exception $e) {
            $this->log('warning', \sprintf('Unable to update cache ttl for tag %s : %s', $tag, $e->getMessage()));

            return false;
        }

        return false;
    }