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Question 83 of 100
API Performance & Load
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Q83: API Load Testing vs. Stress Testing: Core Difference.
⚖️Core Concept
API Load Testing vs. Stress Testing: Core Difference.
Key Takeaways & Architecture Summary
- ✓Load Testing: Validates API behavior under expected daily user traffic.
- ✓Stress Testing: Pushes the API past its limits to find the breaking point.
- ✓Load testing verifies SLA compliance; stress testing evaluates graceful recovery.
Direct Answer Summary
Load testing evaluates API behavior under expected normal and peak traffic loads. Stress testing pushes the system past its defined limits until it breaks, verifying how the application handles resource starvation and whether it recovers gracefully once the load spike subsides.
⚠️ Senior Engineering Warning (Red Flag)
Never think that if an API passes load testing, it is safe from stress spikes. Stress testing is critical to verify how the server crashes: does it fail gracefully (with HTTP 503) or corrupt data?
💡 STAR Architectural Explanation & Pro Tip
Stress testing helps identify memory leaks and database connection locks, ensuring the system can recover automatically without requiring manual restarts.
RestAssuredTest.java
Rest-Assured + Java// k6 options config for a Stress Test (Ramping up to extreme limits)
export const options = {
stages: [
{ duration: '2m', target: 100 }, // Normal Load
{ duration: '5m', target: 1000 }, // Extreme Stress Spike!
{ duration: '2m', target: 0 }, // Ramp down to verify recovery
],
};