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by karmakaze
1661 days ago
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Loading, patching, and deploying without downtime is not very complicated on the surface of it. Basically almost all cloud product/service providers do this with fault-tolerant network design, routing/load-balancing, distributed/fault-tolerant datastores, blue-green continuous integration/delivery (CI/CD) pipelines. The hard part is being very strict to ensure that every change is safe and/or be able to rapidly/automatically restore a working state to stay within a very low error budget. Each '9' in 99.9.. of uptime is order(s) of magnitude harder. |
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