Advanced System Design Fundamentals
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Multi-Tenant Isolation
1. Two Problems That Share a Name
Multi-tenancy creates two distinct problems and they get discussed as one.
- Noisy neighbors. One tenant consumes capacity that the others needed. An availability and fairness problem, and the one teams notice first because it generates complaints.
- Cross-tenant data exposure. One tenant sees another's data. A correctness and security problem, and the one that ends companies.
They are worth separating because the second has no acceptable rate. A noisy neighbor incident is a bad day
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