Monimestarireplikaatiossa

Monimestarireplikaatiossa, a Finnish term roughly translating to "multi-master replication," refers to a database replication topology where multiple database servers can accept write operations. Unlike master-slave setups where only one server is designated as the master for writes, in a multi-master configuration, any of the participating servers can be updated independently. These changes are then propagated to all other servers in the cluster.

This architecture offers several advantages. High availability is a key benefit, as if one server fails, others can continue to handle write requests, minimizing downtime. It also allows for improved read and write performance by distributing the load across multiple servers, and can reduce latency for geographically distributed users by allowing them to write to their nearest server.

However, multi-master replication introduces complexity, primarily around conflict resolution. When two or more masters receive conflicting updates to the same data item simultaneously, a mechanism is needed to determine which update is the correct one and how to reconcile the differences across all replicas. Various strategies exist for conflict resolution, ranging from simple "last writer wins" to more complex application-level logic. Implementing and managing multi-master replication requires careful planning and robust monitoring to ensure data consistency and integrity across the entire system.