Apache Cassandra is a distributed, highly available, horizontally scalable NoSQL database designed to handle massive amounts of data across many commodity servers , with no single point of failure . It is widely used by organizations that require: High write throughput Always-on availability Linear scalability Multi-datacenter replication 1. What is Apache Cassandra? Apache Cassandra is a wide-column store inspired by: Amazon Dynamo (distributed system design) Google Bigtable (data model) Core Characteristics Peer-to-peer architecture (no master) Linear horizontal scalability Tunable consistency Fault tolerance High write performance Schema-based (unlike MongoDB) 2. Cassandra Architecture (High Level) Cassandra uses a ring-based peer-to-peer architecture . Key Components Node – A single Cassandra instance Cluster – A group of nodes Datacenter – Logical grouping of nodes Rack – Physical grouping for fault tolerance Client | Coordinator Node | Replica Nodes (Ring) There is no master node . Every node is equal.…