I use `concurrent.futures.ProcessPoolExecutor` fairly often. I handle inter-process communication usually through a database or message queue, expecting that s

I use `concurrent.futures.ProcessPoolExecutor` fairly often. I handle inter-process communication usually through a database or message queue, expecting that someday I'll want to go clustered instead of just single-machine multiprocessing. I've been burned by implementing multithreading and then needing to overhaul to clustered enough times to stop doing it.