It was this paper and John Wilkes' talk at QCon Lon 2015 on Borg/Omega that helped me understand the architecture and motivation behind K8S, Mesos, Spark and so on.
This is an expanded version in case you were wondering:
>The third edition reflects four years of advancements since the previous edition and nearly doubles the number of pictures and figures. New topics range from additional workloads like video streaming, machine learning, and public cloud to specialized silicon accelerators, storage and network building blocks, and a revised discussion of data center power and cooling, and uptime.
It's a good paper and definitely worth the read.