Comment by fen4o

Exactly. The frameworks that the article describes know how to run say Cassandra or Spark, but you can do the same thing in Kubernetes using TPRs or CRDs with operators:

[0]https://github.com/coreos/prometheus-operator [1]https://github.com/coreos/etcd-operator [2]https://github.com/huawei-cloudfederation/redis-operator [3]https://github.com/CrunchyData/postgres-operator [4]https://github.com/krallistic/kafka-operator [5]https://github.com/pegerto/cassandra-operator