feat(scheduler): scale the extender output in generic scheduler

Author: draveness

pkg/scheduler/apis/extender/v1/types.go

@@ -23,10 +23,10 @@ import (
 
 const (
 	// MinExtenderPriority defines the min priority value for extender.
-	MinExtenderPriority int = 0
+	MinExtenderPriority int64 = 0
 
 	// MaxExtenderPriority defines the max priority value for extender.
-	MaxExtenderPriority int = 10
+	MaxExtenderPriority int64 = 10
 )
 
 // ExtenderPreemptionResult represents the result returned by preemption phase of extender.

pkg/scheduler/core/generic_scheduler.go

@@ -840,7 +840,9 @@ func PrioritizeNodes(
 		// wait for all go routines to finish
 		wg.Wait()
 		for i := range result {
-			result[i].Score += combinedScores[result[i].Name]
+			// MaxExtenderPriority may diverge from the max priority used in the scheduler and defined by MaxNodeScore,
+			// therefore we need to scale the score returned by extenders to the score range used by the scheduler.
+			result[i].Score += combinedScores[result[i].Name] * (framework.MaxNodeScore / extenderv1.MaxExtenderPriority)
 		}
 	}