Few question comes into mind reading this:

- what is the plan to tackle Go's GC?

It seems to me that above a certain scale people run into GC problems with Go.[1]

- have they considered WickedDB?[2]

It appears to be a good candidate for their need.

https://github.com/Fullstop000/wickdb

https://blog.discord.com/why-discord-is-switching-from-go-to...