Designing a highly availabile directory service
As data center failure is common, it is important to have software system to cope with it. Basic strategy is making replication to fail over.
An interesting point regarding this article is replication & recovery scenario for different configuration - in case of 1, 2, 3, 5 datacenter.
More replication makes the system more reliable, and more complicated - even in this kind of imaginary scenario.
Real-life scenario might be far more complex, and need more manual fine-tune to achieve adequate performance & reliability as topology & capability of datacenters & links might be diverse.
It seems hard to generalize the solution.
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