Answer Posted / Amrish Kumar Srivastava

Cassandra's internal architecture is a distributed, decentralized system that utilizes data replication across multiple nodes to ensure high availability and fault tolerance. The basic unit of data storage in Cassandra is called a 'keyspace', which acts as a container for tables (called 'column families'). Within a keyspace, data is stored in partitions, each of which is assigned to a specific node in the cluster. Each partition consists of SSTables (Sorted String Table), Memtables, and the commit log. Memtables are volatile in-memory structures that store recent data and are periodically flushed to SSTables. SSTables are immutable on disk data structures that are sorted by row key. The commit log, also known as the write ahead log (WAL), records all writes until they are successfully committed, ensuring durability in case of failures.

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