PredicateMetadata factory and optimization, Cleaned up some comments,

plugin/pkg/scheduler/algorithm/listers.go

@@ -76,7 +76,7 @@ func (f FakeServiceLister) List(labels.Selector) ([]*api.Service, error) {
 	return f, nil
 }
 
-// GetPodServices gets the services that have the selector that match the labels on the given pod
+// GetPodServices gets the services that have the selector that match the labels on the given pod.
 func (f FakeServiceLister) GetPodServices(pod *api.Pod) (services []*api.Service, err error) {
 	var selector labels.Selector
 
@@ -91,10 +91,6 @@ func (f FakeServiceLister) GetPodServices(pod *api.Pod) (services []*api.Service
 			services = append(services, service)
 		}
 	}
-	if len(services) == 0 {
-		err = fmt.Errorf("Could not find service for pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
-	}
-
 	return
 }
 

plugin/pkg/scheduler/algorithm/predicates/metadata.go

+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package predicates
+
+import (
+	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
+	"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
+)
+
+type PredicateMetadataFactory struct {
+	podLister algorithm.PodLister
+}
+
+func NewPredicateMetadataFactory(podLister algorithm.PodLister) algorithm.MetadataProducer {
+	factory := &PredicateMetadataFactory{
+		podLister,
+	}
+	return factory.GetMetadata
+}
+
+// GetMetadata returns the predicateMetadata used which will be used by various predicates.
+func (pfactory *PredicateMetadataFactory) GetMetadata(pod *api.Pod, nodeNameToInfoMap map[string]*schedulercache.NodeInfo) interface{} {
+	// If we cannot compute metadata, just return nil
+	if pod == nil {
+		return nil
+	}
+	matchingTerms, err := getMatchingAntiAffinityTerms(pod, nodeNameToInfoMap)
+	if err != nil {
+		return nil
+	}
+	predicateMetadata := &predicateMetadata{
+		pod:                       pod,
+		podBestEffort:             isPodBestEffort(pod),
+		podRequest:                GetResourceRequest(pod),
+		podPorts:                  GetUsedPorts(pod),
+		matchingAntiAffinityTerms: matchingTerms,
+	}
+	for predicateName, precomputeFunc := range predicatePrecomputations {
+		glog.V(4).Info("Precompute: %v", predicateName)
+		precomputeFunc(predicateMetadata)
+	}
+	return predicateMetadata
+}

plugin/pkg/scheduler/algorithm/predicates/predicates.go

@@ -36,6 +36,19 @@ import (
 	"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
 )
 
+// predicatePrecomputations: Helper types/variables...
+type PredicateMetadataModifier func(pm *predicateMetadata)
+
+var predicatePrecomputeRegisterLock sync.Mutex
+var predicatePrecomputations map[string]PredicateMetadataModifier = make(map[string]PredicateMetadataModifier)
+
+func RegisterPredicatePrecomputation(predicateName string, precomp PredicateMetadataModifier) {
+	predicatePrecomputeRegisterLock.Lock()
+	defer predicatePrecomputeRegisterLock.Unlock()
+	predicatePrecomputations[predicateName] = precomp
+}
+
+// Other types for predicate functions...
 type NodeInfo interface {
 	GetNodeInfo(nodeID string) (*api.Node, error)
 }
@@ -67,34 +80,21 @@ func (c *CachedNodeInfo) GetNodeInfo(id string) (*api.Node, error) {
 	return node.(*api.Node), nil
 }
 
-// predicateMetadata is a type that is passed as metadata for predicate functions
-type predicateMetadata struct {
-	podBestEffort             bool
-	podRequest                *schedulercache.Resource
-	podPorts                  map[int]bool
-	matchingAntiAffinityTerms []matchingPodAntiAffinityTerm
-}
-
+//  Note that predicateMetdata and matchingPodAntiAffinityTerm need to be declared in the same file
+//  due to the way declarations are processed in predicate declaration unit tests.
 type matchingPodAntiAffinityTerm struct {
 	term *api.PodAffinityTerm
 	node *api.Node
 }
 
-func PredicateMetadata(pod *api.Pod, nodeInfoMap map[string]*schedulercache.NodeInfo) interface{} {
-	// If we cannot compute metadata, just return nil
-	if pod == nil {
-		return nil
-	}
-	matchingTerms, err := getMatchingAntiAffinityTerms(pod, nodeInfoMap)
-	if err != nil {
-		return nil
-	}
-	return &predicateMetadata{
-		podBestEffort:             isPodBestEffort(pod),
-		podRequest:                GetResourceRequest(pod),
-		podPorts:                  GetUsedPorts(pod),
-		matchingAntiAffinityTerms: matchingTerms,
-	}
+type predicateMetadata struct {
+	pod                                *api.Pod
+	podBestEffort                      bool
+	podRequest                         *schedulercache.Resource
+	podPorts                           map[int]bool
+	matchingAntiAffinityTerms          []matchingPodAntiAffinityTerm
+	serviceAffinityMatchingPodList     []*api.Pod
+	serviceAffinityMatchingPodServices []*api.Service
 }
 
 func isVolumeConflict(volume api.Volume, pod *api.Pod) bool {
@@ -627,20 +627,42 @@ type ServiceAffinity struct {
 	labels        []string
 }
 
-func NewServiceAffinityPredicate(podLister algorithm.PodLister, serviceLister algorithm.ServiceLister, nodeInfo NodeInfo, labels []string) algorithm.FitPredicate {
+// serviceAffinityPrecomputation should be run once by the scheduler before looping through the Predicate.  It is a helper function that
+// only should be referenced by NewServiceAffinityPredicate.
+func (s *ServiceAffinity) serviceAffinityPrecomputation(pm *predicateMetadata) {
+	if pm.pod == nil {
+		glog.Errorf("Cannot precompute service affinity, a pod is required to caluculate service affinity.")
+		return
+	}
+
+	var errSvc, errList error
+	// Store services which match the pod.
+	pm.serviceAffinityMatchingPodServices, errSvc = s.serviceLister.GetPodServices(pm.pod)
+	selector := CreateSelectorFromLabels(pm.pod.Labels)
+	// consider only the pods that belong to the same namespace
+	allMatches, errList := s.podLister.List(selector)
+
+	// In the future maybe we will return them as part of the function.
+	if errSvc != nil || errList != nil {
+		glog.Errorf("Some Error were found while precomputing svc affinity: \nservices:%v , \npods:%v", errSvc, errList)
+	}
+	pm.serviceAffinityMatchingPodList = FilterPodsByNamespace(allMatches, pm.pod.Namespace)
+}
+
+func NewServiceAffinityPredicate(podLister algorithm.PodLister, serviceLister algorithm.ServiceLister, nodeInfo NodeInfo, labels []string) (algorithm.FitPredicate, PredicateMetadataModifier) {
 	affinity := &ServiceAffinity{
 		podLister:     podLister,
 		serviceLister: serviceLister,
 		nodeInfo:      nodeInfo,
 		labels:        labels,
 	}
-	return affinity.CheckServiceAffinity
+	return affinity.checkServiceAffinity, affinity.serviceAffinityPrecomputation
 }
 
-// The checkServiceAffinity predicate matches nodes in such a way to force that
-// ServiceAffinity.labels are homogenous for pods added to a node.
-// (i.e. it returns true IFF this pod can be added to this node, such
-// that all other pods in the same service are running on nodes w/
+// checkServiceAffinity is a predicate which matches nodes in such a way to force that
+// ServiceAffinity.labels are homogenous for pods that are scheduled to a node.
+// (i.e. it returns true IFF this pod can be added to this node such that all other pods in
+// the same service are running on nodes with
 // the exact same ServiceAffinity.label values).
 //
 // Details:
@@ -650,46 +672,47 @@ func NewServiceAffinityPredicate(podLister algorithm.PodLister, serviceLister al
 // 	the match.
 // Otherwise:
 // 	Create an "implicit selector" which gaurantees pods will land on nodes with similar values
-//	for the affinity labels.
+// 	for the affinity labels.
+//
 // 	To do this, we "reverse engineer" a selector by introspecting existing pods running under the same service+namespace.
 //	These backfilled labels in the selector "L" are defined like so:
 // 		- L is a label that the ServiceAffinity object needs as a matching constraints.
 // 		- L is not defined in the pod itself already.
 // 		- and SOME pod, from a service, in the same namespace, ALREADY scheduled onto a node, has a matching value.
-func (s *ServiceAffinity) CheckServiceAffinity(pod *api.Pod, meta interface{}, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error) {
+//
+// WARNING: This Predicate is NOT gauranteed to work if some of the predicateMetadata data isn't precomputed...
+// For that reason it is not exported, i.e. it is highlhy coupled to the implementation of the FitPredicate construction.
+func (s *ServiceAffinity) checkServiceAffinity(pod *api.Pod, meta interface{}, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error) {
+	var services []*api.Service
+	var pods []*api.Pod
+	if pm, ok := meta.(*predicateMetadata); ok && (pm.serviceAffinityMatchingPodList != nil || pm.serviceAffinityMatchingPodServices != nil) {
+		services = pm.serviceAffinityMatchingPodServices
+		pods = pm.serviceAffinityMatchingPodList
+	} else {
+		// Make the predicate resilient in case metadata is missing.
+		pm = &predicateMetadata{pod: pod}
+		s.serviceAffinityPrecomputation(pm)
+		pods, services = pm.serviceAffinityMatchingPodList, pm.serviceAffinityMatchingPodServices
+	}
 	node := nodeInfo.Node()
 	if node == nil {
 		return false, nil, fmt.Errorf("node not found")
 	}
-
 	// check if the pod being scheduled has the affinity labels specified in its NodeSelector
 	affinityLabels := FindLabelsInSet(s.labels, labels.Set(pod.Spec.NodeSelector))
-
-	// Introspect services IFF we didn't predefine all the affinity labels in the pod itself.
+	// Step 1: If we don't have all constraints, introspect nodes to find the missing constraints.
 	if len(s.labels) > len(affinityLabels) {
-		services, err := s.serviceLister.GetPodServices(pod)
-		if err == nil && len(services) > 0 {
-			// just use the first service and get the other pods within the service
-			// TODO: a separate predicate can be created that tries to handle all services for the pod
-			selector := labels.SelectorFromSet(services[0].Spec.Selector)
-			servicePods, err := s.podLister.List(selector)
-			if err != nil {
-				return false, nil, err
-			}
-			// consider only the pods that belong to the same namespace
-			nsServicePods := FilterPodsByNamespace(servicePods, pod.Namespace)
-			if len(nsServicePods) > 0 {
-				// consider any service pod and fetch the node its hosted on
-				otherNode, err := s.nodeInfo.GetNodeInfo(nsServicePods[0].Spec.NodeName)
+		if len(services) > 0 {
+			if len(pods) > 0 {
+				nodeWithAffinityLabels, err := s.nodeInfo.GetNodeInfo(pods[0].Spec.NodeName)
 				if err != nil {
 					return false, nil, err
 				}
-				AddUnsetLabelsToMap(affinityLabels, s.labels, labels.Set(otherNode.Labels))
+				AddUnsetLabelsToMap(affinityLabels, s.labels, labels.Set(nodeWithAffinityLabels.Labels))
 			}
 		}
 	}
-
-	// check if the node matches the selector
+	// Step 2: Finally complete the affinity predicate based on whatever set of predicates we were able to find.
 	if CreateSelectorFromLabels(affinityLabels).Matches(labels.Set(node.Labels)) {
 		return true, nil, nil
 	}

plugin/pkg/scheduler/algorithm/predicates/predicates_test.go

@@ -119,6 +119,11 @@ func newResourceInitPod(pod *api.Pod, usage ...schedulercache.Resource) *api.Pod
 	return pod
 }
 
+func PredicateMetadata(p *api.Pod, nodeInfo map[string]*schedulercache.NodeInfo) interface{} {
+	pm := PredicateMetadataFactory{algorithm.FakePodLister{p}}
+	return pm.GetMetadata(p, nodeInfo)
+}
+
 func TestPodFitsResources(t *testing.T) {
 	enoughPodsTests := []struct {
 		pod      *api.Pod
@@ -233,7 +238,6 @@ func TestPodFitsResources(t *testing.T) {
 	for _, test := range enoughPodsTests {
 		node := api.Node{Status: api.NodeStatus{Capacity: makeResources(10, 20, 0, 32).Capacity, Allocatable: makeAllocatableResources(10, 20, 0, 32)}}
 		test.nodeInfo.SetNode(&node)
-
 		fits, reasons, err := PodFitsResources(test.pod, PredicateMetadata(test.pod, nil), test.nodeInfo)
 		if err != nil {
 			t.Errorf("%s: unexpected error: %v", test.test, err)
@@ -289,7 +293,6 @@ func TestPodFitsResources(t *testing.T) {
 	for _, test := range notEnoughPodsTests {
 		node := api.Node{Status: api.NodeStatus{Capacity: api.ResourceList{}, Allocatable: makeAllocatableResources(10, 20, 0, 1)}}
 		test.nodeInfo.SetNode(&node)
-
 		fits, reasons, err := PodFitsResources(test.pod, PredicateMetadata(test.pod, nil), test.nodeInfo)
 		if err != nil {
 			t.Errorf("%s: unexpected error: %v", test.test, err)
@@ -1310,22 +1313,38 @@ func TestServiceAffinity(t *testing.T) {
 		},
 	}
 	expectedFailureReasons := []algorithm.PredicateFailureReason{ErrServiceAffinityViolated}
-
 	for _, test := range tests {
-		nodes := []api.Node{node1, node2, node3, node4, node5}
-		serviceAffinity := ServiceAffinity{algorithm.FakePodLister(test.pods), algorithm.FakeServiceLister(test.services), FakeNodeListInfo(nodes), test.labels}
-		nodeInfo := schedulercache.NewNodeInfo()
-		nodeInfo.SetNode(test.node)
-		fits, reasons, err := serviceAffinity.CheckServiceAffinity(test.pod, PredicateMetadata(test.pod, nil), nodeInfo)
-		if err != nil {
-			t.Errorf("%s: unexpected error: %v", test.test, err)
-		}
-		if !fits && !reflect.DeepEqual(reasons, expectedFailureReasons) {
-			t.Errorf("%s: unexpected failure reasons: %v, want: %v", test.test, reasons, expectedFailureReasons)
-		}
-		if fits != test.fits {
-			t.Errorf("%s: expected: %v got %v", test.test, test.fits, fits)
+		testIt := func(skipPrecompute bool) {
+			nodes := []api.Node{node1, node2, node3, node4, node5}
+			nodeInfo := schedulercache.NewNodeInfo()
+			nodeInfo.SetNode(test.node)
+			nodeInfoMap := map[string]*schedulercache.NodeInfo{test.node.Name: nodeInfo}
+			// Reimplementing the logic that the scheduler implements: Any time it makes a predicate, it registers any precomputations.
+			predicate, precompute := NewServiceAffinityPredicate(algorithm.FakePodLister(test.pods), algorithm.FakeServiceLister(test.services), FakeNodeListInfo(nodes), test.labels)
+			// Register a precomputation or Rewrite the precomputation to a no-op, depending on the state we want to test.
+			RegisterPredicatePrecomputation("checkServiceAffinity-unitTestPredicate", func(pm *predicateMetadata) {
+				if !skipPrecompute {
+					precompute(pm)
+				}
+			})
+			if pmeta, ok := (PredicateMetadata(test.pod, nodeInfoMap)).(*predicateMetadata); ok {
+				fits, reasons, err := predicate(test.pod, pmeta, nodeInfo)
+				if err != nil {
+					t.Errorf("%s: unexpected error: %v", test.test, err)
+				}
+				if !fits && !reflect.DeepEqual(reasons, expectedFailureReasons) {
+					t.Errorf("%s: unexpected failure reasons: %v, want: %v", test.test, reasons, expectedFailureReasons)
+				}
+				if fits != test.fits {
+					t.Errorf("%s: expected: %v got %v", test.test, test.fits, fits)
+				}
+			} else {
+				t.Errorf("Error casting.")
+			}
 		}
+
+		testIt(false) // Confirm that the predicate works without precomputed data (resilience)
+		testIt(true)  // Confirm that the predicate works with the precomputed data (better performance)
 	}
 }
 
@@ -1586,7 +1605,6 @@ func TestEBSVolumeCountConflicts(t *testing.T) {
 			}
 			return "", false
 		},
-
 		FilterPersistentVolume: func(pv *api.PersistentVolume) (string, bool) {
 			if pv.Spec.AWSElasticBlockStore != nil {
 				return pv.Spec.AWSElasticBlockStore.VolumeID, true
@@ -1652,7 +1670,7 @@ func TestPredicatesRegistered(t *testing.T) {
 		if err == nil {
 			functions = append(functions, fileFunctions...)
 		} else {
-			t.Errorf("unexpected error when parsing %s", filePath)
+			t.Errorf("unexpected error %s when parsing %s", err, filePath)
 		}
 	}
 

plugin/pkg/scheduler/algorithm/predicates/utils_test.go

@@ -49,7 +49,11 @@ func ExampleFindLabelsInSet() {
 			},
 		},
 
-		{}, // a third pod which will have no effect on anything.
+		{
+			ObjectMeta: api.ObjectMeta{
+				Name: "pod3ThatWeWontSee",
+			},
+		},
 	}
 	fmt.Println(FindLabelsInSet([]string{"label1", "label2", "label3"}, nsPods[0].ObjectMeta.Labels)["label3"])
 	AddUnsetLabelsToMap(labelSubset, []string{"label1", "label2", "label3"}, nsPods[0].ObjectMeta.Labels)

plugin/pkg/scheduler/algorithm/types.go

@@ -54,6 +54,7 @@ type PriorityConfig struct {
 	Weight   int
 }
 
+// EmptyMetadataProducer returns a no-op MetadataProducer type.
 func EmptyMetadataProducer(pod *api.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo) interface{} {
 	return nil
 }

plugin/pkg/scheduler/algorithmprovider/defaults/defaults.go

@@ -66,6 +66,11 @@ func init() {
 			return priorities.PriorityMetadata
 		})
 
+	factory.RegisterPredicateMetadataProducerFactory(
+		func(args factory.PluginFactoryArgs) algorithm.MetadataProducer {
+			return predicates.NewPredicateMetadataFactory(args.PodLister)
+		})
+
 	// EqualPriority is a prioritizer function that gives an equal weight of one to all nodes
 	// Register the priority function so that its available
 	// but do not include it as part of the default priorities

plugin/pkg/scheduler/extender_test.go

@@ -291,8 +291,7 @@ func TestGenericSchedulerWithExtenders(t *testing.T) {
 			cache.AddNode(&api.Node{ObjectMeta: api.ObjectMeta{Name: name}})
 		}
 		scheduler := NewGenericScheduler(
-			cache, test.predicates, algorithm.EmptyMetadataProducer,
-			test.prioritizers, extenders)
+			cache, test.predicates, algorithm.EmptyMetadataProducer, test.prioritizers, algorithm.EmptyMetadataProducer, extenders)
 		machine, err := scheduler.Schedule(test.pod, algorithm.FakeNodeLister(makeNodeList(test.nodes)))
 		if test.expectsErr {
 			if err == nil {

plugin/pkg/scheduler/factory/factory.go

@@ -363,10 +363,13 @@ func (f *ConfigFactory) CreateFromKeys(predicateKeys, priorityKeys sets.String,
 		return nil, err
 	}
 
-	f.Run()
-
-	algo := scheduler.NewGenericScheduler(f.schedulerCache, predicateFuncs, priorityMetaProducer, priorityConfigs, extenders)
+	predicateMetaProducer, err := f.GetPredicateMetadataProducer()
+	if err != nil {
+		return nil, err
+	}
 
+	f.Run()
+	algo := scheduler.NewGenericScheduler(f.schedulerCache, predicateFuncs, predicateMetaProducer, priorityConfigs, priorityMetaProducer, extenders)
 	podBackoff := podBackoff{
 		perPodBackoff: map[types.NamespacedName]*backoffEntry{},
 		clock:         realClock{},
@@ -408,6 +411,14 @@ func (f *ConfigFactory) GetPriorityMetadataProducer() (algorithm.MetadataProduce
 	return getPriorityMetadataProducer(*pluginArgs)
 }
 
+func (f *ConfigFactory) GetPredicateMetadataProducer() (algorithm.MetadataProducer, error) {
+	pluginArgs, err := f.getPluginArgs()
+	if err != nil {
+		return nil, err
+	}
+	return getPredicateMetadataProducer(*pluginArgs)
+}
+
 func (f *ConfigFactory) GetPredicates(predicateKeys sets.String) (map[string]algorithm.FitPredicate, error) {
 	pluginArgs, err := f.getPluginArgs()
 	if err != nil {

plugin/pkg/scheduler/factory/plugins.go

@@ -78,7 +78,8 @@ var (
 	algorithmProviderMap = make(map[string]AlgorithmProviderConfig)
 
 	// Registered metadata producers
-	priorityMetadataProducer MetadataProducerFactory
+	priorityMetadataProducer  MetadataProducerFactory
+	predicateMetadataProducer MetadataProducerFactory
 
 	// get equivalence pod function
 	getEquivalencePodFunc algorithm.GetEquivalencePodFunc = nil
@@ -121,12 +122,16 @@ func RegisterCustomFitPredicate(policy schedulerapi.PredicatePolicy) string {
 	if policy.Argument != nil {
 		if policy.Argument.ServiceAffinity != nil {
 			predicateFactory = func(args PluginFactoryArgs) algorithm.FitPredicate {
-				return predicates.NewServiceAffinityPredicate(
+				predicate, precomputationFunction := predicates.NewServiceAffinityPredicate(
 					args.PodLister,
 					args.ServiceLister,
 					args.NodeInfo,
 					policy.Argument.ServiceAffinity.Labels,
 				)
+
+				// Once we generate the predicate we should also Register the Precomputation
+				predicates.RegisterPredicatePrecomputation(policy.Name, precomputationFunction)
+				return predicate
 			}
 		} else if policy.Argument.LabelsPresence != nil {
 			predicateFactory = func(args PluginFactoryArgs) algorithm.FitPredicate {
@@ -163,6 +168,12 @@ func RegisterPriorityMetadataProducerFactory(factory MetadataProducerFactory) {
 	priorityMetadataProducer = factory
 }
 
+func RegisterPredicateMetadataProducerFactory(factory MetadataProducerFactory) {
+	schedulerFactoryMutex.Lock()
+	defer schedulerFactoryMutex.Unlock()
+	predicateMetadataProducer = factory
+}
+
 // DEPRECATED
 // Use Map-Reduce pattern for priority functions.
 // Registers a priority function with the algorithm registry. Returns the name,
@@ -312,6 +323,16 @@ func getPriorityMetadataProducer(args PluginFactoryArgs) (algorithm.MetadataProd
 	return priorityMetadataProducer(args), nil
 }
 
+func getPredicateMetadataProducer(args PluginFactoryArgs) (algorithm.MetadataProducer, error) {
+	schedulerFactoryMutex.Lock()
+	defer schedulerFactoryMutex.Unlock()
+
+	if predicateMetadataProducer == nil {
+		return algorithm.EmptyMetadataProducer, nil
+	}
+	return predicateMetadataProducer(args), nil
+}
+
 func getPriorityFunctionConfigs(names sets.String, args PluginFactoryArgs) ([]algorithm.PriorityConfig, error) {
 	schedulerFactoryMutex.Lock()
 	defer schedulerFactoryMutex.Unlock()

plugin/pkg/scheduler/generic_scheduler.go

@@ -61,14 +61,15 @@ func (f *FitError) Error() string {
 }
 
 type genericScheduler struct {
-	cache                schedulercache.Cache
-	predicates           map[string]algorithm.FitPredicate
-	priorityMetaProducer algorithm.MetadataProducer
-	prioritizers         []algorithm.PriorityConfig
-	extenders            []algorithm.SchedulerExtender
-	pods                 algorithm.PodLister
-	lastNodeIndexLock    sync.Mutex
-	lastNodeIndex        uint64
+	cache                 schedulercache.Cache
+	predicates            map[string]algorithm.FitPredicate
+	priorityMetaProducer  algorithm.MetadataProducer
+	predicateMetaProducer algorithm.MetadataProducer
+	prioritizers          []algorithm.PriorityConfig
+	extenders             []algorithm.SchedulerExtender
+	pods                  algorithm.PodLister
+	lastNodeIndexLock     sync.Mutex
+	lastNodeIndex         uint64
 
 	cachedNodeInfoMap map[string]*schedulercache.NodeInfo
 
@@ -104,7 +105,7 @@ func (g *genericScheduler) Schedule(pod *api.Pod, nodeLister algorithm.NodeListe
 	// TODO(harryz) Check if equivalenceCache is enabled and call scheduleWithEquivalenceClass here
 
 	trace.Step("Computing predicates")
-	filteredNodes, failedPredicateMap, err := findNodesThatFit(pod, g.cachedNodeInfoMap, nodes, g.predicates, g.extenders)
+	filteredNodes, failedPredicateMap, err := findNodesThatFit(pod, g.cachedNodeInfoMap, nodes, g.predicates, g.extenders, g.predicateMetaProducer)
 	if err != nil {
 		return "", err
 	}
@@ -153,7 +154,9 @@ func findNodesThatFit(
 	nodeNameToInfo map[string]*schedulercache.NodeInfo,
 	nodes []*api.Node,
 	predicateFuncs map[string]algorithm.FitPredicate,
-	extenders []algorithm.SchedulerExtender) ([]*api.Node, FailedPredicateMap, error) {
+	extenders []algorithm.SchedulerExtender,
+	metadataProducer algorithm.MetadataProducer,
+) ([]*api.Node, FailedPredicateMap, error) {
 	var filtered []*api.Node
 	failedPredicateMap := FailedPredicateMap{}
 
@@ -163,11 +166,12 @@ func findNodesThatFit(
 		// Create filtered list with enough space to avoid growing it
 		// and allow assigning.
 		filtered = make([]*api.Node, len(nodes))
-		meta := predicates.PredicateMetadata(pod, nodeNameToInfo)
 		errs := []error{}
-
 		var predicateResultLock sync.Mutex
 		var filteredLen int32
+
+		// We can use the same metadata producer for all nodes.
+		meta := metadataProducer(pod, nodeNameToInfo)
 		checkNode := func(i int) {
 			nodeName := nodes[i].Name
 			fits, failedPredicates, err := podFitsOnNode(pod, meta, nodeNameToInfo[nodeName], predicateFuncs)
@@ -381,15 +385,17 @@ func EqualPriorityMap(_ *api.Pod, _ interface{}, nodeInfo *schedulercache.NodeIn
 func NewGenericScheduler(
 	cache schedulercache.Cache,
 	predicates map[string]algorithm.FitPredicate,
-	priorityMetaProducer algorithm.MetadataProducer,
+	predicateMetaProducer algorithm.MetadataProducer,
 	prioritizers []algorithm.PriorityConfig,
+	priorityMetaProducer algorithm.MetadataProducer,
 	extenders []algorithm.SchedulerExtender) algorithm.ScheduleAlgorithm {
 	return &genericScheduler{
-		cache:                cache,
-		predicates:           predicates,
-		priorityMetaProducer: priorityMetaProducer,
-		prioritizers:         prioritizers,
-		extenders:            extenders,
-		cachedNodeInfoMap:    make(map[string]*schedulercache.NodeInfo),
+		cache:                 cache,
+		predicates:            predicates,
+		predicateMetaProducer: predicateMetaProducer,
+		prioritizers:          prioritizers,
+		priorityMetaProducer:  priorityMetaProducer,
+		extenders:             extenders,
+		cachedNodeInfoMap:     make(map[string]*schedulercache.NodeInfo),
 	}
 }

plugin/pkg/scheduler/generic_scheduler_test.go

@@ -277,8 +277,7 @@ func TestGenericScheduler(t *testing.T) {
 					},
 				},
 			},
-			pod: &api.Pod{ObjectMeta: api.ObjectMeta{Name: "2"}},
-
+			pod:          &api.Pod{ObjectMeta: api.ObjectMeta{Name: "2"}},
 			prioritizers: []algorithm.PriorityConfig{{Function: numericPriority, Weight: 1}},
 			nodes:        []string{"1", "2"},
 			expectsErr:   true,
@@ -302,8 +301,8 @@ func TestGenericScheduler(t *testing.T) {
 		}
 
 		scheduler := NewGenericScheduler(
-			cache, test.predicates, algorithm.EmptyMetadataProducer,
-			test.prioritizers, []algorithm.SchedulerExtender{})
+			cache, test.predicates, algorithm.EmptyMetadataProducer, test.prioritizers, algorithm.EmptyMetadataProducer,
+			[]algorithm.SchedulerExtender{})
 		machine, err := scheduler.Schedule(test.pod, algorithm.FakeNodeLister(makeNodeList(test.nodes)))
 
 		if !reflect.DeepEqual(err, test.wErr) {
@@ -323,7 +322,7 @@ func TestFindFitAllError(t *testing.T) {
 		"2": schedulercache.NewNodeInfo(),
 		"1": schedulercache.NewNodeInfo(),
 	}
-	_, predicateMap, err := findNodesThatFit(&api.Pod{}, nodeNameToInfo, makeNodeList(nodes), predicates, nil)
+	_, predicateMap, err := findNodesThatFit(&api.Pod{}, nodeNameToInfo, makeNodeList(nodes), predicates, nil, algorithm.EmptyMetadataProducer)
 
 	if err != nil {
 		t.Errorf("unexpected error: %v", err)
@@ -357,7 +356,7 @@ func TestFindFitSomeError(t *testing.T) {
 		nodeNameToInfo[name].SetNode(&api.Node{ObjectMeta: api.ObjectMeta{Name: name}})
 	}
 
-	_, predicateMap, err := findNodesThatFit(pod, nodeNameToInfo, makeNodeList(nodes), predicates, nil)
+	_, predicateMap, err := findNodesThatFit(pod, nodeNameToInfo, makeNodeList(nodes), predicates, nil, algorithm.EmptyMetadataProducer)
 	if err != nil {
 		t.Errorf("unexpected error: %v", err)
 	}

plugin/pkg/scheduler/scheduler_test.go

@@ -388,6 +388,7 @@ func setupTestScheduler(queuedPodStore *clientcache.FIFO, scache schedulercache.
 		predicateMap,
 		algorithm.EmptyMetadataProducer,
 		[]algorithm.PriorityConfig{},
+		algorithm.EmptyMetadataProducer,
 		[]algorithm.SchedulerExtender{})
 	bindingChan := make(chan *api.Binding, 1)
 	errChan := make(chan error, 1)