Architecture · interview question

A bug appears around caching. What is the strongest first debugging move?

Multiple choiceMediumchapter-18-curatedpremiumarchitecturecaching

python

cached = cache.get(order_id)
if cached is None:
    cached = repo.by_id(order_id)
    cache[order_id] = cached

Trace one concrete example, inspect the state transitions, and compare them to the intended rule before rewriting anything.Delay clarity until production traffic reveals the edge case and then patch it under pressure.Keep caching implicit so the script stays short and hope the next engineer infers the rule.Solve the symptom with comments only and avoid changing the code shape around caching.

Answer and explanation

Correct answer

A. Trace one concrete example, inspect the state transitions, and compare them to the intended rule before rewriting anything.

Why

That approach is reliable because it creates evidence. Blind caching can create correctness bugs that are harder to debug than the latency it was meant to solve.

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A bug appears around caching. What is the strongest first debugging move?

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