The content describes the evolution of a system from simple synchronous calculations to complex asynchronous job processing, and when to introduce an orchestration layer. It starts with a simple scenario where a user presses a button and gets results in two seconds within a web app. As the feature evolves, calculations become more serious, taking minutes and becoming CPU or GPU intensive, which pushes the web server beyond its design limits. The content presents two architectural approaches: (1) stretching the web layer by raising timeouts and increasing instances, hoping nothing crashes during calculations, or (2) introducing proper orchestration by separating concerns, delegating jobs, tracking status, implementing safe retries, and allocating CPU/GPU workers as needed. The key insight is that senior engineers recognize the need for orchestration when time becomes part of the architecture - specifically when computation outlives a request. At this point, the system needs job management capabilities rather than just more web server instances.
When computation takes minutes and becomes CPU/GPU heavy, web servers are doing things they were never designed to do
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The decision point is whether the system is still request-response or has become a job management system
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Senior engineers introduce orchestration when time becomes part of the architecture
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When computation outlives a request, you need a system that knows how to manage work rather than more web server instances
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