Reduce number of times subscription statues are updated.

The statuses of the subscriptions are updated multiple number of times
while syncing the resolving namespace. This commit switches to preserving
the state of the subscription statues instead, and only updating the
statuses on cluster only when it's neccessary.

Author: anik120

Diff for: pkg/controller/operators/catalog/operator.go

@@ -991,14 +991,16 @@ func (o *Operator) syncResolvingNamespace(obj interface{}) error {
 			return updateErr
 		}
 		return err
-	} else {
-		subs = o.setSubsCond(subs, v1alpha1.SubscriptionResolutionFailed, "", "", false)
+	}
+
+	subs = o.setSubsCond(subs, v1alpha1.SubscriptionResolutionFailed, "", "", false)
+	defer func() {
 		_, updateErr := o.updateSubscriptionStatuses(subs)
 		if updateErr != nil {
-			logger.WithError(updateErr).Debug("failed to update subs conditions")
+			logger.WithError(updateErr).Warn("failed to update subscription conditions")
 		}
-		updatedSubs = o.setSubsCond(updatedSubs, v1alpha1.SubscriptionResolutionFailed, "", "", false)
-	}
+	}()
+	updatedSubs = o.setSubsCond(updatedSubs, v1alpha1.SubscriptionResolutionFailed, "", "", false)
 
 	// create installplan if anything updated
 	if len(updatedSubs) > 0 {
@@ -1030,9 +1032,12 @@ func (o *Operator) syncResolvingNamespace(obj interface{}) error {
 			return err
 		}
 		updatedSubs = o.setIPReference(updatedSubs, maxGeneration+1, installPlanReference)
-		if _, err := o.updateSubscriptionStatuses(updatedSubs); err != nil {
-			logger.WithError(err).Debug("error ensuring subscription installplan state")
-			return err
+		for _, updatedSub := range updatedSubs {
+			for i, sub := range subs {
+				if sub.Name == updatedSub.Name && sub.Namespace == updatedSub.Namespace {
+					subs[i] = updatedSub
+				}
+			}
 		}
 	} else {
 		logger.Debugf("no subscriptions were updated")