I've seen a lot about Raft lately. I've recently built a Python library for stream processing that uses multiprocessing to manage the stages of the data pipeline and the thing I'm most interested in next is figuring out the best way to distribute it across a cluster of machines and am curious using something like Raft would be beneficial in managing the cluster of processes in some way.

Also remember seeing Google's Millwheel which is of great interest considering my current project.

Why? (I mean, why in JavaScript?)

Because, sadly, browsers are the most portable runtime we have available.