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CachingHardSDE-3
Your app runs in Mumbai and Hyderabad regions, each with its own Redis. The database primary is in Mumbai with a replica in Hyderabad. How do you keep both caches correct?
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JioHotstarMetaPhonePe
Think first
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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