Cassandra: Replication and Consistency

In this presentation, by Benjamin Black, we get an introduction to Cassandra's replication and consistency model. Black provides us with a very concise and easily understood definition of both replication and consistency.

Replication. How many copies of the data do we want in the system?

Consistency Level. How many replicas must respond to declare success?

In addition, to providing us with good definitions Black proceeds to discuss a number of topics. Including partitioning, snitching and placement. Essentially, it provides a good high level intro to some very low level concepts of Cassandra.