Grokking the System Design Interview
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Quiz - Designing Instagram
Design
Test Your Knowledge
Check your understanding and reinforce the key concepts covered in this section with a short, targeted assessment.
9 Questions
~14 mins
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Jeremiah Stones
· a month ago
Suggested Correction for Question: "Hybrid Feed Delivery"
- Question Text: "Which of the following describes a 'hybrid' approach for feed delivery mentioned in the text?"
- Target Answer Choice: "Pushing to users with few follows and letting those with many follows pull data."
The target answer choice uses ambiguous and technically imprecise phrasing regarding system design feed architectures (Push vs. Pull / Fan-out on Write vs. Read).
- Issue: Feed delivery models scale based on an account's follower count (fan-out on write), rather than how many accounts a user follows.
- Regular users: Use Push (Fan-out on Write), a new post is written directly to all followers' feed caches.
- High-follower accounts (celebrities/influencers): Bypass push
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