distributed systemsexpertReddit r/ExperiencedDevs thread with 400+ upvotesMAX
Leader Election Split-Brain in Multi-Region Control Planes : Cold-Path Replay and Backfill Correctness
GoetcdgRPCPrometheus
Problem Breakdown
The vulnerable surface is the cold path: replay, backfill, and migration jobs that process historical data at scale, which every production system runs but almost none tests. When a multi-region control plane loses its inter-region consensus link, both datacenter partitions run leader election concurrently and each pro…
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