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A comment on Why Twitter didn’t go down: From a real Twitter SRE. Parent comment

Re:Why Twitter didn’t go down: From a real Twitter SRE by pmoriarty on Tuesday November 22, 2022 @07:47AM (#33705170)
There are some major pieces missing from your analysis: legacy code and infrastructure, and lack of good documentation.

These can make for a massive hairball of complexity that can swell the number of people needed to support it.

This reminds me of a talk I once saw by a Netflix SRE, who showed a crazy convoluted mess of a diagram with thousands of crisscrossing lines going everywhere, and him screaming "No one understands Netflix!!!"

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Re:Why Twitter didn’t go down: From a real Twitter SRE by lightbendover on Tuesday November 22, 2022 @09:58AM (#33706497)
If you think Netflix is bad, you should see architecture diagrams for one of the major ad platforms; 30+ service sub-systems get encapsulated as a tiny block of the massive diagram. Anyone who thinks complex systems can be built and maintained by a skeleton crew hasn't worked on complex systems or hasn't been exposed to their full scope.
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