Problems / Design a product, medium
Design nearby search from an empty canvas: find businesses around a location with a geospatial index, show business pages from a cache, and take reviews, at 2,000 requests a second.
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Request types to route: nearby (60%, read), details (30%, read), review (10%, write). Budget: $3,200 a month.
You start from an empty canvas. When you run the tests, each one simulates your design with its own traffic and failures:
| Test | What it does | Passes when |
|---|---|---|
| Normal day | The normal day: the traffic in the brief, nothing broken. | Success ≥ 99.9%; p99 latency ≤ 100 ms (nearby); p99 latency ≤ 60 ms (details) |
| Lunch rush | At 5 s everyone looks for lunch at once: traffic triples for 8 s. | Success ≥ 99%; p99 latency ≤ 150 ms (nearby) |
| Cache flushed | At 5 s the cache on the request path is emptied, as after a restart or a bad deploy. | Success ≥ 99%; p99 latency ≤ 150 ms (details) |
| A server dies | At 4 s one server of the first app service on the request path dies for 10 s. | Success ≥ 99% |
| Budget: $3,200/month | The normal day's design must cost at most $3,200 a month. | Cost ≤ $3,200/month |