![]() 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. Defcon presents a common interface to product developers to define feature knobs that represent degradation capabilities. They are: DEFCON 5: Normal peacetime readiness. ![]() this is a sepculation website, no movement of troops has shown that we might be at defcon 2. There are five levels, which signify varying conditions of readiness. In response to overload conditions, Defcon enables site operators to gradually disable less-critical features in order to reduce resource demand. This is the first time since the Cuban missile crisis. In this paper, we introduce Defcon, a system for improving the availability of large-scale, globally-distributed Internet services using graceful feature degradation. 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? Every day, billions of people depend on Internet services for communication, commerce, and entertainment.
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