THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Controller/Operator: Kubernetes ships built-in controllers such as StatefulSet that ensures the number of replicas for an application is up and running. Users can also develop their own operators (The idiom in Kubernetes community to usually call user-developed controllers as operator). In this case, the operator is similar to the AM in YARN.
Node Components
Kubelet: An agent that runs on each node in the cluster. It makes sure that containers are running in a Pod. This is similar to NodeManager in YARN.
Pod: A group of one or more containers, with shared storage/network, and a specification for how to run the containers (refer to here). Note that Pod is similar to the container concept in YARN.
Container-runtime: The container runtime is the software that is responsible for running containers, most notably, docker.
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