Handling Primary Database Failovers Safely!
Your primary just crashed and the replica is sitting right there. Promote it too fast and you risk data corruption and split brain, two failures that are worse than the outage itself. This one shows how a senior engineer stays calm and fails over in the right order.
You'll learn why users can still read while the primary is down, what replication lag tells you about the writes at risk, why a returning primary is the real danger, and how one proxy endpoint turns failover into a single change.
Would you fence the old primary first, or promote the replica and sort it out later? Tell us in the comments.
#SystemDesign #HighAvailability #Databases #DatabaseFailover #SplitBrain #DevOps #PostgreSQL #MySQL #SoftwareArchitecture #BackendEngineering #SRE #KodeKloud