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Sharding, replication & partitioningHardSDE-3
In a ride-hailing app, millions of drivers send their location every 4 seconds. How do you partition the live location data so that 'find drivers near this rider' is fast?
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OlaRapidoUber
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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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