Cassandra

1. Architecture overview

   Ring topology, nodes, partitions and replicas.

2. Dynamo-style distribution

   Consistent hashing, gossip, replication and tunable consistency.

3. Storage engine

   Commit log, memtables and SSTables.

4. Guarantees

   CAP trade-offs, consistency levels and lightweight transactions.

5. Data modeling

   Query-first modeling, partition and clustering keys.

6. CQL

   DDL, DML, types, functions and security statements.

7. Indexing with SAI

   Storage-attached indexes and secondary indexes.

8. Configuration

   cassandra.yaml and runtime settings.

9. Compaction

   Compaction strategies and tuning.

10. Repair and read repair

    Anti-entropy repair, hints and read repair.

11. Topology changes

    Adding, removing and replacing nodes.

12. Backups and snapshots

    Snapshots, incremental backups and restore.

13. Security

    Authentication, authorization, TLS and auditing.

14. Metrics and logging

    JMX metrics, logging and virtual tables.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

Source: endoflife.date