"Those guys" are Google engineers, and Chronos is built on Mesos, which has drawn a lot of inspiration from Google's datacenter-scale computing architecture. Th

"Those guys" are Google engineers, and Chronos is built on Mesos, which has drawn a lot of inspiration from Google's datacenter-scale computing architecture. This project probably predates Chronos by a significant margin. Also, I'm not familiar with Chronos in detail, but from the documentation, it doesn't look like it supports the exactly-once execution semantics that Google's cron replacement is aiming for.