Primary-Backup Replication
Primary-Backup Replication is a fault-tolerance technique in distributed systems where data or services are duplicated from a primary node to one or more backup nodes. It ensures high availability and data durability by maintaining replicas that can take over if the primary fails, commonly used in databases, file systems, and server clusters. This approach typically involves synchronous or asynchronous replication to keep backups consistent with the primary.
Developers should learn and use Primary-Backup Replication when building systems that require high reliability, such as financial applications, healthcare databases, or critical infrastructure, to prevent data loss and minimize downtime during failures. It is particularly useful in scenarios where strong consistency is needed, as backups can be quickly promoted to handle requests if the primary node becomes unavailable, ensuring seamless service continuity.