Apache Cassandra Cluster on Ubuntu Server 20.04

Apache Cassandra is a popular, open-source NoSQL database software. It provides high availability while handling a large amount of data. Regular relational databases cannot handle linear scaling, seamless data distribution, and other big data requirements as efficient as Cassandra.

Systems like Cassandra are designed for these challenges and seek the following design objectives:

• Full multi-master database replication
• Global availability at low latency
• Scaling out on commodity hardware
• Linear throughput increase with each additional processor
• Online load balancing and cluster growth
• Partitioned key-oriented queries
• Flexible schema

• Keyspace: defines how a dataset is replicated, for example in which datacenters and how many copies. Keyspaces contain tables.
• Table: defines the typed schema for a collection of partitions. Cassandra tables have flexible addition of new columns to tables with zero downtime. Tables contain partitions, which contain partitions, which contain columns.
• Partition: defines the mandatory part of the primary key all rows in Cassandra must have. All performant queries supply the partition key in the query.
• Row: contains a collection of columns identified by a unique primary key made up of the partition key and optionally additional clustering keys.