[jamesblonde]

That's an issue, I guess for many apps. However, Google tend to make company-wide technical decisions, and then the entire engineering crowd go there. How many other companies have one SCM instance? None. If there were unrefutable economic gains to be made by moving to Omega today, my guess they would do it.

The technically interesting question is whether decentralized scheduling in the large scale is a solved problem or not. Can we do it better than centralized today?

[nostrademons]

Google absolutely does not make company-wide technical decisions and then the entire engineering crowd goes there. Rather, they make company-wide technical decisions, and over a period of 3-5 years the entire engineering crowd gradually gets there. As we used to say: "There are two ways to do everything at Google: the deprecated one and the one that doesn't work yet." In some cases I've seen up to 3 deprecated systems in flight, plus one that doesn't work yet. Borg's predecessor was finally removed from production shortly before I left in 2014, despite being deprecated around 2005.