System Design Interview Alex Wu Pdf Github _verified_ (Certified)

For preparing with renowned book, System Design Interview – An Insider's Guide

Designing a Scalable System

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1. Requirements: Shorten URLs to a fixed length, store the original URL and shortened URL in a database, and return the shortened URL to the user.
2. Assumptions: Assume a high-traffic application with millions of users, and a database that can store billions of rows.
3. High-level design: Use a load balancer to distribute incoming traffic, a caching layer to store frequently accessed URLs, and a database to store the original and shortened URLs.
4. Trade-offs: Discuss trade-offs between using a relational database versus a NoSQL database, and between using a caching layer versus relying on the database.

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• Load-test fan-out-on-write at celebrity-scale.
• Bench pre-signed upload flows under mobile networks.
• Tune TTLs and trimming strategy for Redis timelines.

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