Commits on Apr 27, 2021

1. 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>

   

   qinqon committed Apr 27, 2021
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