How many master nodes can be configured in a Master-Master architecture?

In a Master-Master (also known as Active-Active) architecture, the number of master nodes is theoretically unlimited, but in practice, it depends on the specific implementation and requirements for consistency and performance.

For example, in distributed systems with Master-Master replication, each master can accept writes and synchronize data with other masters. However, increasing the number of masters complicates synchronization and raises the risk of conflicts.

Most systems typically use 2 to 3 masters to balance load and ensure fault tolerance. A larger number of masters requires more complex conflict resolution mechanisms and can reduce performance.

Therefore, the exact number of master nodes depends on the architecture and requirements, but it is usually a small number (2-3) to maintain a balance between availability and synchronization complexity.