[alpb]

Kubernetes takes some concepts from Borg. A system like Borg would be very closely coupled to Google‘s infrastructure that there’s probably very little to open source from there without open sourcing the entire machinery.

Also, any large scale system like Borg developed at a large company like Facebook or Google will have completely opinionated one-way-of-doing-things for a lot of aspects. This doesn’t work for the world outside where lots of developers from different backgrounds, lots of projects with different requirements exist.

[obeattie]

I think this bit from "Borg, Omega, and Kubernetes"[1] (which is an excellent read) sheds light on this:

> The Borgmaster is a monolithic component that knows the semantics of every API operation. It contains the cluster management logic such as the state machines for jobs, tasks, and machines; and it runs the Paxos-based replicated storage system used to record the master’s state.

So it sounds as though Borg includes its own storage system. As I understand, Google has a set of (very complex) libraries written in C++ that implement Paxos/Multi-Paxos[2], which they have not open sourced.

[1] https://research.google.com/pubs/pub44843.html [2] https://research.google.com/archive/paxos_made_live.html