/kind feature

Any resource without a domain name or with kubernetes.io/ domain name should continue to be treated as first class. Everything else could be treated as integer resources, until a future API allows specifying whether a resource is integral/fractional.

Opaque Integer Resources (also called OIR, alpha in v1.5.0), is implemented by special-casing resources with a certain prefix. Since the default scheduler currently handles all resources except CPU as integers, this could be codified as default behavior for resources that do not belong to the kubernetes.io/ namespace. This would reduce the proliferation of very similar code in admission control, scheduler predicates, kubelet, kubectl, etc. when adding support for additional classes of resources, such as resources advertised by extensions. The initial use case is the upcoming alpha device plugin interface. Resources advertised via device plugins will share the extensions.kubernetes.io/ namespace.

Related issues:

• feature: extension to support new compute resources
• proposal: hardware accelerators

cc @vishh @RenaudWasTaken @thockin @davidopp