[Feature] Warn Users When Updating the RayClusterSpec in RayJob CR (r…

…ay-project#1778)

ray-operator/controllers/ray/rayjob_controller.go

@@ -558,6 +558,12 @@ func (r *RayJobReconciler) getOrCreateRayClusterInstance(ctx context.Context, ra
 	}
 	r.Log.Info("Found associated RayCluster for RayJob", "RayJob", rayJobInstance.Name, "RayCluster", rayClusterNamespacedName)
 
+	// Verify that RayJob is not in cluster selector mode first to avoid nil pointer dereference error during spec comparison.
+	// This is checked by ensuring len(rayJobInstance.Spec.ClusterSelector) equals 0.
+	if len(rayJobInstance.Spec.ClusterSelector) == 0 && !utils.CompareJsonStruct(rayClusterInstance.Spec, *rayJobInstance.Spec.RayClusterSpec) {
+		r.Log.Info("Disregard changes in RayClusterSpec of RayJob", "RayJob", rayJobInstance.Name)
+	}
+
 	return rayClusterInstance, nil
 }