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Sharding, replication & partitioningMediumSDE-2
Your cache cluster uses hash(key) mod N to pick a node. When you added one node to go from 10 to 11, the hit rate dropped to almost zero and the database got overloaded. Explain and fix it.
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Answer out loud as you would in the room — clarify, give numbers, name the trade-off — then compare with the model answer.
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