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The property of distributed message passing systems that everyone likes is the arbitrary scalability. Subsystem performing slowly? Add more nodes! The cost of this arbitrary scalability, as you have noticed, is brittleness, single points of failure, and complexity that will drive even the most seasoned of engineers nuts.

In the end though, the users want their tweets and they don't care how it works. Complexity is why we make so much money, after all.




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