Hey @hujunfei
We do plan to have an enterprise version which would have some advanced features like ACLs, cluster management, multi-tenancy, auto-scaling on Amazon, Google, etc. That鈥檚 targetted mostly towards big companies and would only happen after v1.0. We plan to keep the enterprise version free for small companies and startups. So give it a try 
You can read more here Product Roadmap 路 Issue #1 路 dgraph-io/dgraph 路 GitHub.