Caching & Read-Heavy Systems

How read-dominated systems use caches, CDNs, and precomputation to make the hot path effectively free.

1. 1
   URL ShortenerBeginner

   Hashing, key generation, read-heavy caching.
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2. 2
   Instagram FeedIntermediate

   Fan-out on write vs read, ranking, CDN.
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3. 3
   Netflix (Video Streaming)Advanced

   CDN-first, adaptive bitrate, recommendation.
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