Perf improvements for existing resource restore

Use informer cache with dynamic client for Get calls on restore
When enabled, also make the Get call before create.

Add server and install parameter to allow disabling this feature,
but enable by default

Signed-off-by: Scott Seago <sseago@redhat.com>

pkg/controller/restore_controller.go

@@ -101,6 +101,7 @@ type restoreReconciler struct {
 	logFormat                   logging.Format
 	clock                       clock.WithTickerAndDelayedExecution
 	defaultItemOperationTimeout time.Duration
+	disableInformerCache        bool
 
 	newPluginManager  func(logger logrus.FieldLogger) clientmgmt.Manager
 	backupStoreGetter persistence.ObjectBackupStoreGetter
@@ -123,6 +124,7 @@ func NewRestoreReconciler(
 	metrics *metrics.ServerMetrics,
 	logFormat logging.Format,
 	defaultItemOperationTimeout time.Duration,
+	disableInformerCache bool,
 ) *restoreReconciler {
 	r := &restoreReconciler{
 		ctx:                         ctx,
@@ -135,6 +137,7 @@ func NewRestoreReconciler(
 		logFormat:                   logFormat,
 		clock:                       &clock.RealClock{},
 		defaultItemOperationTimeout: defaultItemOperationTimeout,
+		disableInformerCache:        disableInformerCache,
 
 		// use variables to refer to these functions so they can be
 		// replaced with fakes for testing.
@@ -519,13 +522,14 @@ func (r *restoreReconciler) runValidatedRestore(restore *api.Restore, info backu
 	}
 
 	restoreReq := &pkgrestore.Request{
-		Log:               restoreLog,
-		Restore:           restore,
-		Backup:            info.backup,
-		PodVolumeBackups:  podVolumeBackups,
-		VolumeSnapshots:   volumeSnapshots,
-		BackupReader:      backupFile,
-		ResourceModifiers: resourceModifiers,
+		Log:                  restoreLog,
+		Restore:              restore,
+		Backup:               info.backup,
+		PodVolumeBackups:     podVolumeBackups,
+		VolumeSnapshots:      volumeSnapshots,
+		BackupReader:         backupFile,
+		ResourceModifiers:    resourceModifiers,
+		DisableInformerCache: r.disableInformerCache,
 	}
 	restoreWarnings, restoreErrors := r.restorer.RestoreWithResolvers(restoreReq, actionsResolver, pluginManager)