When a Dependency Fails
Choose containment actions for downstream dependency latency or failure.
Homepage p95 jumps from 400 ms to 2.4 s because recommendations are slow. The dependency is optional, but the current behavior makes it critical. Contain dependency blast radius Use timeouts and fallbacks to protect the primary user journey. A dependency failure should degrade the feature it powers, not the whole service. Detect dependency impact Traces show homepage waits 1.8 s on recommendations. What is the first containment move? Protect resources Thread pools are filling with waiting recommendation calls. What reduces local saturation? Fresh application The tax provider is required for final checkout totals, not optional. What changes? Containment depends on…
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