I'm not sure if you're allowed to talk about it, but... I remember a talk by Rob Pike where he mentioned that Sawzall was one of the first major MR users withi

I'm not sure if you're allowed to talk about it, but... I remember a talk by Rob Pike where he mentioned that Sawzall was one of the first major MR users within Google. But IIRC, Sawzall has been retired at Google some time ago, and the successor to it was developed in Go. Does the successor follow the same or similar principles in terms of parallelization, or did you follow another approach?