Yep, but there's an important difference I think... Mesos (some customizations, but largely the same as open-source Apache Mesos) IS what Twitter uses to deplo

Yep, but there's an important difference I think... Mesos (some customizations, but largely the same as open-source Apache Mesos) IS what Twitter uses to deploy and manage their clusters. Battle-hardened at scale running diverse production workloads. With Kubernetes, we're told that it is built using architectural and philosophical principles proven to work at scale on Google's production systems. But it's a fairly clean-room built-from-scratch implementation and although developing quickly, is still immature and untested.