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RAG Index Versioning and Blue-Green Retrieval (EXPLAINED)

Project BasedRAGHard18 min read

Hard RAG ops question on index versioning, dual-write, and blue-green cutovers.

TL;DR — Quick Answer

Treat the index as a versioned artifact: build a new index (or namespace) offline, run shadow queries against it, dual-read for a canary cohort, then cut over. Keep the previous version hot for instant rollback and pin prompt configs to index versions.

The Interview Question

How do you version a RAG vector index so you can roll forward or back embeddings, chunking, and metadata without downtime?

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