Support Weight for NodeOrder Plugin

Author: thandayuthapani

pkg/scheduler/plugins/nodeorder/nodeorder.go

@@ -18,6 +18,7 @@ package nodeorder
 
 import (
 	"fmt"
+	"strconv"
 
 	"github.com/golang/glog"
 
@@ -32,6 +33,17 @@ import (
 	"github.com/kubernetes-sigs/kube-batch/pkg/scheduler/framework"
 )
 
+const (
+	// NodeAffinityWeight is the key for providing Node Affinity Priority Weight in YAML
+	NodeAffinityWeight = "nodeaffinity.weight"
+	// PodAffinityWeight is the key for providing Pod Affinity Priority Weight in YAML
+	PodAffinityWeight = "podaffinity.weight"
+	// LeastRequestedWeight is the key for providing Least Requested Priority Weight in YAML
+	LeastRequestedWeight = "leastrequested.weight"
+	// BalancedResourceWeight is the key for providing Balanced Resource Priority Weight in YAML
+	BalancedResourceWeight = "balancedresource.weight"
+)
+
 type nodeOrderPlugin struct {
 	// Arguments given for the plugin
 	pluginArguments map[string]string
@@ -155,9 +167,92 @@ func (pp *nodeOrderPlugin) Name() string {
 	return "nodeorder"
 }
 
+type priorityWeight struct {
+	leastReqWeight          int
+	nodeAffinityWeight      int
+	podAffinityWeight       int
+	balancedRescourceWeight int
+}
+
+func calculateWeight(args map[string]string) priorityWeight {
+	/*
+	   User Should give priorityWeight in this format(nodeaffinity.weight, podaffinity.weight, leastrequested.weight, balancedresource.weight).
+	   Currently supported only for nodeaffinity, podaffinity, leastrequested, balancedresouce priorities.
+
+	   actions: "reclaim, allocate, backfill, preempt"
+	   tiers:
+	   - plugins:
+	     - name: priority
+	     - name: gang
+	     - name: conformance
+	   - plugins:
+	     - name: drf
+	     - name: predicates
+	     - name: proportion
+	     - name: nodeorder
+	       arguments:
+	         nodeaffinity.weight: 2
+	         podaffinity.weight: 2
+	         leastrequested.weight: 2
+	         balancedresource.weight: 2
+	*/
+
+	// Values are initialized to 1.
+	weight := priorityWeight{
+		leastReqWeight:          1,
+		nodeAffinityWeight:      1,
+		podAffinityWeight:       1,
+		balancedRescourceWeight: 1,
+	}
+
+	// Checks whether nodeaffinity.weight is provided or not, if given, modifies the value in weight struct.
+	if args[NodeAffinityWeight] != "" {
+		val, err := strconv.Atoi(args[NodeAffinityWeight])
+		if err != nil {
+			glog.Warningf("Not able to Parse Weight for %v because of error: %v", args[NodeAffinityWeight], err)
+		} else {
+			weight.nodeAffinityWeight = val
+		}
+	}
+
+	// Checks whether podaffinity.weight is provided or not, if given, modifies the value in weight struct.
+	if args[PodAffinityWeight] != "" {
+		val, err := strconv.Atoi(args[PodAffinityWeight])
+		if err != nil {
+			glog.Warningf("Not able to Parse Weight for %v because of error: %v", args[PodAffinityWeight], err)
+		} else {
+			weight.podAffinityWeight = val
+		}
+	}
+
+	// Checks whether leastrequested.weight is provided or not, if given, modifies the value in weight struct.
+	if args[LeastRequestedWeight] != "" {
+		val, err := strconv.Atoi(args[LeastRequestedWeight])
+		if err != nil {
+			glog.Warningf("Not able to Parse Weight for %v because of error: %v", args[LeastRequestedWeight], err)
+		} else {
+			weight.leastReqWeight = val
+		}
+	}
+
+	// Checks whether balancedresource.weight is provided or not, if given, modifies the value in weight struct.
+	if args[BalancedResourceWeight] != "" {
+		val, err := strconv.Atoi(args[BalancedResourceWeight])
+		if err != nil {
+			glog.Warningf("Not able to Parse Weight for %v because of error: %v", args[BalancedResourceWeight], err)
+		} else {
+			weight.balancedRescourceWeight = val
+		}
+	}
+
+	return weight
+}
+
 func (pp *nodeOrderPlugin) OnSessionOpen(ssn *framework.Session) {
 	nodeOrderFn := func(task *api.TaskInfo, node *api.NodeInfo) (int, error) {
 
+		weight := calculateWeight(pp.pluginArguments)
+
 		pl := &podLister{
 			session: ssn,
 		}
@@ -188,21 +283,24 @@ func (pp *nodeOrderPlugin) OnSessionOpen(ssn *framework.Session) {
 			glog.Warningf("Least Requested Priority Failed because of Error: %v", err)
 			return 0, err
 		}
-		score = score + host.Score
+		// If leastReqWeight in provided, host.Score is multiplied with weight, if not, host.Score is added to total score.
+		score = score + (host.Score * weight.leastReqWeight)
 
 		host, err = priorities.BalancedResourceAllocationMap(task.Pod, nil, nodeInfo)
 		if err != nil {
 			glog.Warningf("Balanced Resource Allocation Priority Failed because of Error: %v", err)
 			return 0, err
 		}
-		score = score + host.Score
+		// If balancedRescourceWeight in provided, host.Score is multiplied with weight, if not, host.Score is added to total score.
+		score = score + (host.Score * weight.balancedRescourceWeight)
 
 		host, err = priorities.CalculateNodeAffinityPriorityMap(task.Pod, nil, nodeInfo)
 		if err != nil {
 			glog.Warningf("Calculate Node Affinity Priority Failed because of Error: %v", err)
 			return 0, err
 		}
-		score = score + host.Score
+		// If nodeAffinityWeight in provided, host.Score is multiplied with weight, if not, host.Score is added to total score.
+		score = score + (host.Score * weight.nodeAffinityWeight)
 
 		mapFn := priorities.NewInterPodAffinityPriority(cn, nl, pl, v1.DefaultHardPodAffinitySymmetricWeight)
 		interPodAffinityScore, err = mapFn(task.Pod, nodeMap, nodeSlice)
@@ -211,7 +309,8 @@ func (pp *nodeOrderPlugin) OnSessionOpen(ssn *framework.Session) {
 			return 0, err
 		}
 		hostScore := getInterPodAffinityScore(node.Name, interPodAffinityScore)
-		score = score + hostScore
+		// If podAffinityWeight in provided, host.Score is multiplied with weight, if not, host.Score is added to total score.
+		score = score + (hostScore * weight.podAffinityWeight)
 
 		glog.V(4).Infof("Total Score for that node is: %d", score)
 		return score, nil