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: For a user with 500 friends, one update triggers 500 notifications. To scale, only fan-out to friends who are also currently active and within a reasonable distance. System Design Interview by Alex Xu.pdf - GitHub

to handle ambiguity, stressing the importance of asking the right clarifying questions and engaging the interviewer in a collaborative design session. Key System Design Scenarios system design interview alex xu volume 2 pdf github upd

: Summarize the design, mention trade-offs, and suggest potential future improvements. 3. Key Concepts to Master : For a user with 500 friends, one