Intermediate LevelMongoDB & Mongoose
How do Retryable Writes handle transient network failures in MongoDB drivers?
❓ Interview Prompt: Explain Retryable Writes (retryWrites=true), handling transient network disconnects, txnNumber tracking, and idempotent execution.
Retryable Writes allow MongoDB client drivers to automatically retry supported write operations ('insertOne', 'updateOne', 'deleteOne') ONCE if a network disconnect or primary node election occurs:
Idempotent Safety:
The driver attaches a unique transaction number ('txnNumber') to writes, ensuring the MongoDB server rejects duplicate write execution if the initial attempt succeeded before network dropped!
Code Implementation Example
typescript
import mongoose from 'mongoose';
// Enable Retryable Writes in MongoDB connection URI (default in modern drivers)
const uri = 'mongodb://replica-set-host:27017/prod?retryWrites=true&w=majority';
async function connectWithRetryableWrites() {
await mongoose.connect(uri);
}💡Configuring Retryable Writes in MongoDB connection URI.
🎯 Interview Key Takeaway
Keep retryWrites=true enabled in connection URIs to protect applications from transient network drop failures.
#Retryable Writes#Network Resilience#Idempotency#Intermediate
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