Implemented taints and tolerations priority function as a Score plugin

pkg/scheduler/framework/plugins/migration/utils.go

@@ -17,6 +17,7 @@ limitations under the License.
 package migration
 
 import (
+	"k8s.io/klog"
 	"k8s.io/kubernetes/pkg/scheduler/algorithm/predicates"
 	framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
 )
@@ -88,3 +89,18 @@ func (p *PrioritiesStateData) Clone() framework.StateData {
 		Reference: p.Reference,
 	}
 }
+
+// PriorityMetadata returns priority metadata stored in CycleState.
+func PriorityMetadata(state *framework.CycleState) interface{} {
+	if state == nil {
+		return nil
+	}
+
+	var meta interface{}
+	if s, err := state.Read(PrioritiesStateKey); err == nil {
+		meta = s.(*PrioritiesStateData).Reference
+	} else {
+		klog.Errorf("reading key %q from CycleState, continuing without metadata: %v", PrioritiesStateKey, err)
+	}
+	return meta
+}