![]() ![]() At Meta, we have used Defcon to improve global product availability in the face of worldwide demand-surges in addition to large-scale infrastructure failures. ![]() ![]() Defcon automatically tests knobs to understand each knob’s product- and infrastructure-level trade-offs. Everybody shake a leg because it’s about to go down. Defcon presents a common interface to product developers to define feature knobs that represent degradation capabilities. At DECON 2, yup - something’s up and now we want all active duty personnel to mobilize and deploy in six hours or less. In response to overload conditions, Defcon enables site operators to gradually disable less-critical features in order to reduce resource demand. In this paper, we introduce Defcon, a system for improving the availability of large-scale, globally-distributed Internet services using graceful feature degradation. DEFCON 5 is the lowest state of readiness, while DEFCON 1 is maximum readiness, meaning a nuclear war is about to begin or already has begun. Yet planetary-scale data center infrastructures consisting of millions of servers experience unplanned capacity outages and unexpected demand for resources how can such infrastructures remain reliable in the face of capacity and workload flux? There are five levels, from DEFCON 1 to 5. Every day, billions of people depend on Internet services for communication, commerce, and entertainment. ![]()
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