System design: news feed fan-out

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Task

📝 **Question:** Why does the production answer split users into 'push' and 'pull' tiers?

📋 Pick the right answer.

💡 **Hint:** Re-read the theory above if unsure.

Keep going

🎯predict

Big-O proof: Master Theorem

🎯writeFREE

Two pointers: pair sum

🎯write

Two pointers: palindrome check

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Prerequisites — what you should know before this track

⚡predictFREE

Prerequisites — what you should know before this track

🎯 Quiz

Question

📝 **Question:** Why does the production answer split users into 'push' and 'pull' tiers?

📋 Pick the right answer.

💡 **Hint:** Re-read the theory above if unsure.

Keep going

💬 Discussion