protected static function normalizeHostString($hostString, $port = 26379)
    {
        $hosts = [ ];

        foreach (explode(',', $hostString) as $host) {
            $host = trim($host);

            if (Str::contains($host, ':')) {
                $hosts[] = $host;
            } else {
                $hosts[] = [ 'host' => $host, 'port' => $port ];
            }
        }

        return $hosts;
    }