Description: The ‘Schema Agreement’ in distributed databases, such as Apache Cassandra, refers to a state where all nodes within a cluster share and maintain the same database schema. This means that the definitions of tables, columns, and data types are consistent across each node, which is crucial for ensuring data integrity and coherence. In a distributed environment, where data may be replicated across multiple nodes, it is essential that any schema changes, such as adding a new column or modifying a data type, propagate uniformly to all nodes. This agreement is achieved through a consensus process that allows nodes to communicate and synchronize their schemas. The ability to maintain schema agreement is fundamental to the system’s performance and stability, as it prevents conflicts and ensures that applications interacting with the database function correctly. Furthermore, Schema Agreement is a key component in distributed database architecture, which is designed to be highly scalable and fault-tolerant, allowing nodes to join or leave the cluster without interrupting service.
