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(I was in the bigger engineering team at Amazon that looked into this between between '04-'08.)

After having notable issues with Cisco's hardware load balancers, there was an internal project at Amazon aimed at developing scalable routing solutions.

After years of development effort, it turned out that the "better" solutions didn't work well in production, at least not for our workloads. So we went back to million $ hardware load balancers and random routing.

I don't know if things changed after I left, but I can tell you it wasn't an easy problem. So I completely buy the robustness and simplicity argument these guys are making.




Awesome info, thanks. This has been exactly our experience.

In theory, clever load distribution algorithms (of which one can imagine many variations) are very compelling. Maybe like object databases, or visual programming, or an algorithm that can detect when your program has hit an infinite loop. These are all compelling, but ultimately impractical or impossible in the real world.

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Nope, DRR is still dead :)

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