🌱 System Design (Beginner) · Data Layer · cozy lesson
Replication & Sharding
12 min · 1 min read · no scary math, promise
🤖
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Shard by user_id hash. Rebalance with consistent hashing. Writes: quorum or single leader? Beginner: leader + 2 replicas + cache.
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Correct answers earn XP (once each).
1. Replicas help…
2. Hot key fix?
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