LLD - Design — Splitwise (Expense Sharing)
In a system where transactions can arrive out of order, how should the balance calculation algorithm be adapted?
In a system where transactions can arrive out of order, how should the balance calculation algorithm be adapted?
hard📝 Trade-off Q9 of Q15
Step-by-Step Solution
Solution:
Step 1: Recognize out-of-order arrival problem
Transactions arriving out of order can cause incorrect balances if processed as received.Step 2: Use timestamps to order
Ordering by timestamps ensures transactions are applied in correct sequence.Final Answer:
Use timestamps to order transactions before applying them -> Option CQuick Check:
Out-of-order fix = Timestamp ordering [OK]
Quick Trick: Sort transactions by time before processing [OK]
Common Mistakes:
MISTAKES- Ignoring order causing wrong balances
- Processing only latest transaction
- Resetting balance unnecessarily
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