Which pillar of the Well-Architected Framework is MOST related to a requirement to keep a service running even when a component fails and to automatically recover from failures?
A question asking which pillar matches a requirement for resilience and automatic recovery.
Reliability
Correct. The Reliability pillar covers the ability of a system to keep functioning as intended — recovering from failures, handling demand changes, and mitigating failures. A design that keeps running and automatically recovers despite failures is exactly the central theme of the Reliability pillar.
Cost Optimization
The Cost Optimization pillar covers eliminating unnecessary spending and delivering value at the lowest cost.
The requirement to keep running and recover from failures belongs to Reliability, not to cost, so it is incorrect.
Sustainability
The Sustainability pillar covers minimizing energy consumption and environmental impact.
This is a different perspective from the requirement to recover from failures, so it is incorrect.
Performance Efficiency
The Performance Efficiency pillar covers using resources efficiently to deliver the performance the requirements call for.
Keeping running and recovering during failures itself belongs to Reliability, so it is incorrect.
Mapping requirements to pillars is common. “Keep running/auto-recover despite failures” → Reliability, “reduce spending” → Cost Optimization, “environmental impact” → Sustainability, “performance efficiency” → Performance Efficiency. Practice deriving the pillar from keywords.