Blanket statements like "Cassandra doesn't work" and "Hadoop is a complete waste of hosts for most companies" are unproductive and contribute nothing, unless yo

Blanket statements like "Cassandra doesn't work" and "Hadoop is a complete waste of hosts for most companies" are unproductive and contribute nothing, unless you can back them with data and real world examples. So, what data do you base these assertions on ? Also, not to burst your bubble but a lot of businesses (if not the majority) run Spark on YARN. And Spark is built on the JVM.