Backend & systems·Consistency and replication
two regions both accept writes to the same record and something now has to decide which version wins.
Multi-leader replication
Also calledactive-active, multi-master
A topology where more than one node accepts writes and they replicate to each other. It buys local write latency and survives a region loss without promotion. It introduces write conflicts as a permanent design problem, and last-write-wins conflict resolution silently discards data.