Senior LevelMongoDB & Mongoose
How do you execute Zero-Downtime Data Center Migrations using live replica set member addition?
❓ Interview Prompt: Explain zero-downtime cluster migrations, adding remote target nodes to replica set, oplog catch-up, and stepping down primary.
Zero-downtime migration involves adding new target datacenter nodes to an existing replica set, allowing initial sync via oplog catch-up, and stepping down the old primary.
Code Implementation Example
typescript
console.log('Zero-downtime migration: rs.add() -> Oplog Catch-Up -> rs.stepDown()');💡Zero-downtime live cluster migration workflow.
🎯 Interview Key Takeaway
Migrate clusters without downtime by adding target nodes to the active replica set and executing primary stepdown.
#Zero-Downtime#Migration#Replica Sets#Senior
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