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Consistency & distributed transactionsHardSDE-3
Your wallet is sharded by user_id. User A on shard 1 sends Rs 500 to user B on shard 7. How do you make the transfer correct without a distributed transaction?
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CREDPaytmPhonePeRazorpayStripe
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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