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6/29/2026
54/60 Days System Design Questions

54/60 Days System Design Questions

Short summary

A deployed RAG pipeline fails after 6 months due to data drift—the embedding index becomes stale as new documents are added but never rebuilt. The author presents a real constraint (50M chunks, 400GB index, $800 rebuild cost, 6-week model cycles) and four architectural solutions (scheduled rebuild, incremental upserts, version registry, staleness detection) for readers to evaluate and discuss.

  • •Data drift causes RAG degradation without any code changes
  • •Four architectural approaches to maintaining stale indexes at scale
  • •Real constraints: 50M chunks, $800 rebuild cost, 6-week update cycles

Generated with AI, which can make mistakes.

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