Google cloud storage API (XML or Json ) only permit 1 upload per second .
https://cloud.google.com/storage/docs/concepts-techniques
You can update a particular object up to once per second. Updating a particular object faster than once per second may result in 503 Service Unavailable errors. Concurrent updates to distinct objects are not subject to the one update per second limit.
So how to upload new 20 milions diffrence object google storage ?
P/s : i have ~20M small file in HDD , so i want to upload all to google cloud storage .