AWS bans using relational database for services because the failure modes are complex.
Hidden optimizations and query plan flips can wreak chaos.
From @colmmacc's session on control systems.
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Replying to @josh_robb @colmmacc
Wow. But is this one of those things that only kicks in at AWS or Netflix scale? We've had our share of dB queries, but been able to reason about them.
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Is this a new thing or something Amazon has always done?
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It's been gradual over time. 9 years ago I had to really arduously convince a Senior Vice President that we had no better option in one case, and got granted an exception. That would be much much harder now ... because of the greater field of options.
9:17 PM - 26 Nov 2018
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