kubernetes/kops · error

error walking over %T: %w

Error message

error walking over %T: %w

What it means

MapToUnstructured walks the kube-scheduler options struct recursively with ReflectRecursive to produce an unstructured map. Any error raised by the walker (including the Quantity conversion error above) is wrapped with this message identifying the options type. It is a wrapper, so the root cause is in the wrapped %w error.

Source

Thrown at pkg/model/components/kubescheduler/model.go:195

				}
				// Clear the field, so we don't set the flag
				val.Set(reflect.Zero(val.Type()))
			default:
				if err := setValue(targetPath, val.Interface()); err != nil {
					return err
				}
				// Clear the field, so we don't set the flag
				empty := reflect.New(val.Type()).Elem()
				val.Set(empty)
			}
		}

		return reflectutils.SkipReflection
	}

	err := reflectutils.ReflectRecursive(reflect.ValueOf(options), walker, &reflectutils.ReflectOptions{DeprecatedDoubleVisit: true, JSONNames: true})
	if err != nil {
		return fmt.Errorf("error walking over %T: %w", options, err)
	}

	return nil
}

View on GitHub (pinned to 4c8573c808)

Solutions

1. Read the wrapped (%w) cause below this message in the log — fix the underlying walker error (usually the Quantity conversion).
2. Validate the kube-scheduler options in your cluster spec for malformed numeric/quantity values.
3. If it persists, enable kOps verbose logging to see which struct field the reflection walker failed on.

Example fix

// before
// inspecting only the outer message: "error walking over *kops.KubeSchedulerConfig"
// after
// check wrapped cause: kops get cluster -o yaml | grep -A5 kubeScheduler  -> fix invalid quantity

if schedulerOptions == nil { return errors.New("kubeScheduler options must be initialized before MapToUnstructured") }

func isWalkError(err error) bool { return err != nil && strings.Contains(err.Error(), "error walking over") }

if err := MapToUnstructured(opts, &target); err != nil {
    var wrapped error
    if errors.As(err, &wrapped) || errors.Unwrap(err) != nil {
        log.Printf("scheduler walk root cause: %v", errors.Unwrap(err))
    }
    return err
}

When it happens

Trigger: Calling buildSchedulerConfig / MapToUnstructured with a KubeSchedulerConfig whose fields fail reflective traversal — e.g. an invalid *resource.Quantity, or a field setter (setValue) returning an error during the walk.

Common situations: Building a cluster with unusual scheduler flag/resource values in the spec; running unit tests like Test_MapToUnstructured_WithQpsAndBurst with malformed inputs.

Related errors

• unable to convert from Quantity %v to float
• listing secrets %v
• getting secret %q: %v
• error building kube-scheduler pod: %v
• error marshaling pod to yaml: %v

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/d88535f63f87abb5. Report an issue: GitHub.