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Add SelectorsByObject option to cache
Controller-Runtime controllers use a cache to subscribe to events from Kubernetes objects and to read those objects more efficiently by avoiding to call out to the API. This cache is backed by Kubernetes informers. The only way to filter this cache is by namespace and resource type. In cases where a controller is only interested in a small subset of objects (for example all pods on a node), this might end up not being efficient enough. This change increase the "pkg/cache" interface adding the "BuildWithOptins" function and the "Options.SelectorsByObject" option. The SelectorsByObject restricts the cache's ListWatch to the desired fields per GVK at the specified object, the map's value must implement Selector [1] using for example a Set [2] This is the implementation of the design document [3] [1] https://pkg.go.dev/k8s.io/apimachinery/pkg/fields#Selector [2] https://pkg.go.dev/k8s.io/apimachinery/pkg/fields#Set [3] https://github.com/kubernetes-sigs/controller-runtime/blob/master/designs/use-selectors-at-cache.md Signed-off-by: Quique Llorente <ellorent@redhat.com>
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