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Incremental Indexing and Document Updates (ANSWERED)

Scenario BasedRAGMedium15 min read

Medium RAG interview question on incremental indexing and document updates — architecture, trade-offs, eval, and production patterns.

TL;DR — Quick Answer

Track content hashes and document versions; upsert or delete only affected chunks on change. Use CDC from CMS/object storage events instead of nightly full re-embeds. Propagate tombstones promptly so deleted docs never surface in answers.

The Interview Question

Explain incremental indexing and document updates. How would you design, implement, and evaluate this in a production RAG system? Discuss trade-offs and failure modes.

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