The distributed part of the system probably depends on other components of Google's proprietary infrastructure, e.g., for cluster job scheduling. So it's a bit

The distributed part of the system probably depends on other components of Google's proprietary infrastructure, e.g., for cluster job scheduling. So it's a bit of work to tear that out and replace with something that's externally usable. I can't tell whether they've committed to doing that, but I hope they do.