[lidavidm]

Hey, I'd be curious to hear what's stopping you from using Arrow Flight (unless you mean that you plan to use Arrow Flight for remote things, and a zero-copy interface locally). (I am an Arrow maintainer and have worked a lot with Flight, though I speak only for myself here.)

[mavam]

Basically that: use Flight as default IPC mechanism, but when local, use a plasma’ish mmap facility (for zero copy).