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Design a small subsystem that relies on Fixed-Size Sliding Window
Design a small subsystem that relies on Fixed-Size Sliding Window
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Audio N/AQuick interview answer
Sketch components, data flow, failure modes, and metrics around Fixed-Size Sliding Window. Example shape: Network monitor: max bytes/sec over any 60-second rolling window from per-second samples.
Detailed answer
Mini design using Fixed-Size Sliding Window: • Components: API edge, worker/queue, store, and observability. • Data flow: request → Fixed-Size Sliding Window-related path → response/async side effects. • Failure modes: timeouts, overload, partial dependency loss. • Metrics: latency, errors, saturation for the Fixed-Size Sliding Window path. Guardrails: State window size k explicitly; track running aggregate incrementally. Parent context: Pros: O(n) single pass; avoids recomputing overlapping segments from scratch. Cons: Only applies when window size is fixed; variable windows need expand/shrink logic.
Full explanation
Interviewers want a crisp architecture story anchored on Fixed-Size Sliding Window, not a buzzword list. Maintain a window of size k; slide by adding the right element and subtracting the left. Ideal for max/min/average of every contiguous subarray of length k.
Follow-up questions
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Parent context — Fixed-Size Sliding Window
Pros: O(n) single pass; avoids recomputing overlapping segments from scratch. Cons: Only applies when window size is fixed; variable windows need expand/shrink logic.
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