Google paper with a title focused on their ad infrastructure, but it's really a broader overview of their systems and architecture choices, ending with "we started building systems with multi-homing designed in from the start, and found that to be a much better solution. Multi-homed systems run with better availability and lower cost, and result in a much simpler system overall. The simplicity of a multi-homed system is particularly valuable for users. Without multi-homing, failover, recovery, and dealing with inconsistency are all application problems. With multi-homing, these hard problems are solved by the infrastructure, so the application developer gets high availability and consistency for free and can focus instead on building their application. Based on our experiences, we now expect all of our systems, and any future systems we build, to have native multi-homing support as a key part of the design."
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