The elasticity of the public cloud mainly manifests in the user's ability to use its resources on demand. When you need more resources to support the workload, you can quickly purchase resources; when you no longer need these resources, you can release them immediately. The elasticity of the public cloud mentioned in the article mainly refers to its ability to provide resources to users on demand.
As a developer, I get that stateless applications are more readily scalable. However, for stateful software like databases and message queues, scaling becomes a challenge and necessitates a redesign of the architecture.
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