Problems / RAG and retrieval, medium
A document assistant OCRs scanned pages on demand: 12 slots, 1.5 seconds per page, 15 pages a second.
Free to open. Runs in your browser, no sign-up.
Success ≥ 99%, p99 ≤ 10 s.
15 requests a second for 30 seconds: 100% request (reads).
What each component does in this design, and what calls it. The simulator mimics each one from these settings.
| Component | Its job here | Settings |
|---|---|---|
| Load balancerLoad balancer | Traffic enters here.Calls AI app.Layer 4 balancers route by IP and port; layer 7 balancers read HTTP and can route by path or header. | – |
| AI appApp service | Load balancer forwards to it.Calls OCR / document AI.Little's law: throughput ≈ concurrency ÷ latency. 200 slots at 50 ms serve about 4,000 req/s. | 3 replicas × 500 slots · timeout 30 s |
| OCR / document AIOCR / document AI | AI app calls it.OCR turns scanned pages into text; layout and tables are the hard part. | 12 slots · 1,800 calls/min |
Try it first. Open one hint at a time if you get stuck.
12 ÷ 1.5 s = 8 pages a second.
Follow one question through each retrieval stage; the stage that turns red is the one to fix first.
Add OCR capacity (better: OCR once at ingestion).