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KEP 1645: clarify port conflict rules #4887

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KEP 1645: clarify port conflict rules #4887

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14 changes: 10 additions & 4 deletions keps/sig-multicluster/1645-multi-cluster-services-api/README.md
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Expand Up @@ -994,10 +994,16 @@ The conflict will be resolved by assigning precedence based on each
A derived service will be accessible with the clusterset IP at the ports
dictated by child services. If the external properties of service ports for a
set of exported services don’t match, the clusterset service will expose the
union of service ports declared on its constituent services. Should a port name
be used for multiple non-identical (`port`, `protocol`, `appProtocol`) service
ports by different constituent services, the conflict resolution policy will
determine which values are used by the derived service.
union of service ports declared on its constituent services.

Like regular services, the resulting ports must respect two rules:
- Have no duplicated names (including unnamed/empty name)
- Two ports must not have the same protocol and port number

As a result, MCS-API implementations should merge ports from constituent
services first based on port name then by the protocol and port number pair.
The conflict resolution policy will determine which of the duplicated ports
are used by the ServiceImport.

#### Headlessness

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