Architecture

This section describes the general architecture of Apache Cassandra. If you are new to Cassandra internals, read the pages in this order:

Start with Overview for the high-level system model.
Read Dynamo next to understand partitioning, replication, and eventual consistency.
Read Accord only after that, because Accord adds transactional guarantees on top of the base Dynamo-style model.

Use the deeper Accord pages when you are actively working on transactions or migration behavior.