A quick and simple explanation of Kafka!
Object persistence API for Cassandra.
Managed: Anything managed out-side of Java EE container (typically coded for Java SE). Managed objects can run outside of/or without java EE container. Non-managed: Anything managed by the Java EE container (such as EJB, etc.). Non-managed objects require a Java EE container to run.
How to migrate SQL app to Cassandra