|Don't ask to ask, just ask|
The downside of that mechanism is control. If, as the OP says later, the need to suspend or terminate the processing early arises, then you're stuck with starting the whole process over from scratch. Same thing if the number of workers varies up or down.
With server/clients approach, pause and restart the clients, or knock out half the clients--or double them--and the processing continues without duplication and automatically redistributes to accommodate the changes.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
In reply to Re^3: randomising file order returned by File::Find