Multi Leader Replication

In contrast to single-leader replication, allowing multiple nodes to accept writes is known as multileader replication or active/active or master-master replication. Each node processing a write must forward the change to all other nodes, thus a leader in this scenario is also simultaneously a follower.

One of the use cases of multileader replication is when a distributed system has data spread across multiple datacenters which are geographically distant from each other. Such an architecture is usually employed to move data closer to the users or be able to withstand failure of an entire datacenter. Additionally, with single leader-based replication, the leader resides in one of the data centers and all writes must be routed through that datacenter to reach that single leader. In a multi-leader replication architecture, each datacenter has its own leader and replication within a datacenter follows the single-leader replication mechanism. However, among the datacenters, leaders from each datacenter replicate ...