Can healthy work continue when one component fails?
Process isolation and decoupling services address failure at different scales. Both limit propagation, but shared resources can still carry failure across a boundary.
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Can a service survive a local failure? →Compare containing an exceptional condition with isolating a failing process. In each case ask which healthy work can still proceed.How far can one bottleneck spread? →Process isolation contains certain runtime failures. Decoupling services can contain a capacity problem. Identify what is still shared before relying on either boundary.Who manages a service after startup? →A service manager responds to change across a system. Isolated processes contain failures inside a running application. Each boundary protects different work.
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when a process crashes everything else progresses right so most of the system still worksthe ability to isolate bottlenecks so that they don't spread through the system