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Application requirements have changed dramatically in recent years. Only a few years ago a large application had tens of servers, seconds of response time, hours of offline maintenance and gigabytes of data. Today applications are deployed on everything from mobile devices to cloud-based clusters running thousands of multicore processors. Users expect millisecond or even microsecond response times and 100% uptime. Data needs are expanding into the petabytes.
But now a new architecture has evolved to let developers conceptualize and build applications that satisfy today’s demands. We call these Reactive Applications. This architecture allows developers to build systems that are event-driven, scalable, resilient and responsive: delivering highly responsive user experiences with a real-time feel, backed by a scalable and resilient application stack, ready to be deployed on multicore and cloud computing architectures. The Reactive Manifesto describes these critical traits which are needed for going reactive.