Add namespace index to pod informer

Signed-off-by: kerthcet <[email protected]>

Author: kerthcet

pkg/coscheduling/coscheduling.go

@@ -25,6 +25,7 @@ import (
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/runtime"
 	clientscheme "k8s.io/client-go/kubernetes/scheme"
+	"k8s.io/client-go/tools/cache"
 	corev1helpers "k8s.io/component-helpers/scheduling/corev1"
 	"k8s.io/klog/v2"
 	"k8s.io/kubernetes/pkg/scheduler/framework"
@@ -74,6 +75,9 @@ func New(obj runtime.Object, handle framework.Handle) (framework.Plugin, error)
 		return nil, err
 	}
 
+	// Performance improvement when retrieving list of objects by namespace or we'll log 'index not exist' warning.
+	handle.SharedInformerFactory().Core().V1().Pods().Informer().AddIndexers(cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
+
 	scheduleTimeDuration := time.Duration(args.PermitWaitingTimeSeconds) * time.Second
 	pgMgr := core.NewPodGroupManager(
 		client,