Problems / RAG and retrieval, medium
A chat assistant keeps long conversations within the context window by summarising older turns with a small model before every answer. The summariser has 12 slots at about half a second; 40 turns arrive a second.
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Success ≥ 99%, time to first token p99 ≤ 2.5 s.
Like a coding problem, a solution has to pass every case, not just the one it was built for. Submit in the lab runs all 4; 1 of them are hidden until then.
40 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 Memory summariser, Model.Little's law: throughput ≈ concurrency ÷ latency. 200 slots at 50 ms serve about 4,000 req/s. | 3 replicas × 500 slots · timeout 30 s |
| Memory summariserMemory summarizer | AI app calls it.Summarising older turns keeps long sessions inside the context window. | 12 slots · 1 steps |
| ModelLLM endpoint | AI app calls it.Latency has two parts: time to the first token, then a steady stream of tokens per second. | 2000 streams |