[backend] CreatePVC's default storage class doesn't match default storage class set in the cluster

[tumido]

Kubernetes has a concept of a default Storage Class.

One would expect that by using kfp.kubernetes.CreatePVC without specifying storage_class_name results in using this default storage class. Instead, a hardcoded standard storage class is used (no matter if such class even exist on the cluster)

Environment

• How did you deploy Kubeflow Pipelines (KFP)? - as part of Red Hat OpenShift AI
• KFP version: 2.2.0
• KFP SDK version: 2.10.1

Steps to reproduce

Use kfp.kubernetes.CreatePVC task without storage_class_name. A PVC with .spec.storageClassName: "standard" is created instead of one using the Storage class actually set as the default one in Kubernetes.

Expected result

Not specifying storage_class_name results in submitting the PVC without .spec.storageClassName property set and therefore result in the Kubernetes default storage class being applied.

Materials and Reference

• https://kubernetes.io/docs/tasks/administer-cluster/change-default-storage-class/

• pipelines/backend/src/v2/driver/driver.go

  Lines 1695 to 1703 in 2e05b3d

  	// Optional input: storage_class_name
  	// When not provided, use default value `standard`
  	storageClassNameInput, ok := inputs.ParameterValues["storage_class_name"]
  	var storageClassName string
  	if !ok {
  	storageClassName = "standard"
  	} else {
  	storageClassName = storageClassNameInput.GetStringValue()
  	}

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