feat(scheduler): return error when score is out of range

pkg/scheduler/framework/v1alpha1/framework.go

@@ -431,8 +431,16 @@ func (f *framework) ApplyScoreWeights(pc *PluginContext, pod *v1.Pod, scores Plu
 			errCh.SendErrorWithCancel(err, cancel)
 			return
 		}
-		for i := range nodeScoreList {
-			nodeScoreList[i].Score = nodeScoreList[i].Score * weight
+
+		for i, nodeScore := range nodeScoreList {
+			// return error if score plugin returns invalid score.
+			if nodeScore.Score > MaxNodeScore || nodeScore.Score < MinNodeScore {
+				err := fmt.Errorf("score plugin %q returns an invalid score %q, it should in the range of [MinNodeScore, MaxNodeScore] after normalizing", pl.Name(), nodeScore.Score)
+				errCh.SendErrorWithCancel(err, cancel)
+				return
+			}
+
+			nodeScoreList[i].Score = nodeScore.Score * weight
 		}
 	})
 

pkg/scheduler/framework/v1alpha1/framework_test.go

@@ -604,6 +604,60 @@ func TestApplyScoreWeights(t *testing.T) {
 			},
 			err: true,
 		},
+		{
+			name:    "Score plugin return score greater than MaxNodeScore",
+			plugins: plugin1And2,
+			input: PluginToNodeScores{
+				scorePlugin1: {
+					{
+						Name:  "node1",
+						Score: MaxNodeScore + 1,
+					},
+					{
+						Name:  "node2",
+						Score: 3,
+					},
+				},
+				scorePlugin2: {
+					{
+						Name:  "node1",
+						Score: MinNodeScore,
+					},
+					{
+						Name:  "node2",
+						Score: 5,
+					},
+				},
+			},
+			err: true,
+		},
+		{
+			name:    "Score plugin return score less than MinNodeScore",
+			plugins: plugin1And2,
+			input: PluginToNodeScores{
+				scorePlugin1: {
+					{
+						Name:  "node1",
+						Score: MaxNodeScore,
+					},
+					{
+						Name:  "node2",
+						Score: 3,
+					},
+				},
+				scorePlugin2: {
+					{
+						Name:  "node1",
+						Score: MinNodeScore - 1,
+					},
+					{
+						Name:  "node2",
+						Score: 5,
+					},
+				},
+			},
+			err: true,
+		},
 	}
 
 	for _, tt := range tests {

pkg/scheduler/framework/v1alpha1/interface.go

@@ -61,6 +61,14 @@ const (
 	Skip
 )
 
+const (
+	// MaxNodeScore is the maximum score a Score plugin is expected to return.
+	MaxNodeScore int = 10
+
+	// MinNodeScore is the minimum score a Score plugin is expected to return.
+	MinNodeScore int = 0
+)
+
 // Status indicates the result of running a plugin. It consists of a code and a
 // message. When the status code is not `Success`, the status message should
 // explain why.

test/integration/scheduler/framework_test.go

@@ -152,11 +152,11 @@ func (sp *ScorePlugin) Score(pc *framework.PluginContext, p *v1.Pod, nodeName st
 		return 0, framework.NewStatus(framework.Error, fmt.Sprintf("injecting failure for pod %v", p.Name))
 	}
 
-	score := 10
+	score := 1
 	if sp.numScoreCalled == 1 {
 		// The first node is scored the highest, the rest is scored lower.
 		sp.highScoreNode = nodeName
-		score = 100
+		score = framework.MaxNodeScore
 	}
 	return score, nil
 }