...

The CRD volumeClaimTemplate can be null to maintain compatibility with the released 1.1.0 and before version.

References

• [1].FLIP-225: Implement standalone mode support in the kubernetes operator - Apache Flink - Apache Software Foundation
• [2].Use StatefulSet instead of Deployment for TMs and JM · Issue #353 · GoogleCloudPlatform/flink-on-k8s-operator (github.com)

Test Plan

We can test the creation of the dynamic PVC by creating a Flink standalone cluster in a real k8s clusters, And kill one TaskManager pod and wait for it recovered and mount previous existed PVC successfully.

CR Example with name flink-standalone-pvc-statefulset and in namespace: flink-application-system

###check all pvcs dynamic-created by cr.
kubectl get pvcs -n flink-application-system

kubectl kill
###delete one taskmanager pod.
kubectl delete pod {pod_name} -n flink-application-system

Delete the CR, all created PVCs will be retained, those can be deleted manually and permanently.

...

Or using other operator like flink-on-k8s-operator to mount one-to-one PVC for each TMs.

References

• [1].FLIP-225: Implement standalone mode support in the kubernetes operator - Apache Flink - Apache Software Foundation
• [2].Use StatefulSet instead of Deployment for TMs and JM · Issue #353 · GoogleCloudPlatform/flink-on-k8s-operator (github.com)