I&#x27;ve used goamz in the past. It&#x27;s good code, but I always had problems with lack of connection reuse on S3. Apparently coaxing S3 into not closing KeepAlive connections is non-trivial, and with goamz they&#x27;d always get closed.<p>This is a huge problem when you&#x27;re trying to upload several million tiny files as quickly as possible.<p>When I switched to Amazon&#x27;s official S3 library, this problem went away.