Senior LevelSystem Design & Architecture
How do you design Graceful Degradation and Fallback strategies for mission-critical web applications?
❓ Interview Prompt: Explain Graceful Degradation, Fallback mechanisms, static fallback responses, shed load, and maintaining core functionality during outages.
Graceful Degradation ensures an application maintains essential core capabilities even when non-critical subsystems or microservices experience major outages:
Practical Implementation:
If the Recommendation Microservice fails on an e-commerce product page:
•
Brittle Failure: Entire product page returns HTTP 500 error!
•
Graceful Degradation: Catch Recommendation API timeout and render the page with a static fallback list of "Top Selling Items" instead!
Code Implementation Example
typescript
export async function getRecommendedProducts(userId: string) {
try {
return await recommendationClient.fetchForUser(userId);
} catch (err) {
// Graceful Degradation: Fallback to static top-rated products!
logger.warn('Recommendation service down; using static fallback');
return await staticFallbackCache.getTopProducts();
}
}💡Executing static fallback responses during downstream service outages.
🎯 Interview Key Takeaway
Design applications with Graceful Degradation so failures in secondary services do not crash primary user workflows.
#System Design#Graceful Degradation#Resilience#Fallback#Senior
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