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Product
- The product equals "tenant" in BFE, which has its own configuration, such as routing policy, permission, etc.
- Field "host" in HTTP header is used to identify product that the incoming message belongs to.
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Cluster
- Cluster means a set of backend servers which provide same functionality and process similar task.
- Usually，cluster span multiple IDC/region in scope.
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Sub Cluster
- A cluster may be composed of multiple sub clusters conceptually.
- Usally, backend servers within one IDC/region is defined as a sub cluster.
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Instance
- Instance is backend server. A sub cluster would contain multiple instances.
- To BFE，each backend instance expose IP address + port to accept request.