[jira] [Created] (FLINK-30329) flink-kubernetes-operator helm chart does not work with dynamic config because of use of ConfigMap subPath

["Andrew Otto (Jira)" <ji...@apache.org>]

Andrew Otto created FLINK-30329:
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             Summary: flink-kubernetes-operator helm chart does not work with dynamic config because of use of ConfigMap subPath
                 Key: FLINK-30329
                 URL: https://issues.apache.org/jira/browse/FLINK-30329
             Project: Flink
          Issue Type: Bug
          Components: Kubernetes Operator
            Reporter: Andrew Otto


flink-kubernetes-operator supports dynamic configuration when {{kubernetes.operator.dynamic.config.enabled}} is enabled.  The provided helm charts make use of a k8s ConfigMap to provide the flink-conf.yaml file.  These helm charts make use of the {{subPath}} ConfigMap feature.  When ConfigMaps use {{{}subPath{}}}, the volume that uses them is not updated automatically.  So, even you do update the ConfigMap in k8s, the flink-conf.yaml file will never see those updates.
 * [https://kubernetes.io/docs/concepts/configuration/configmap/#mounted-configmaps-are-updated-automatically]
 * [https://kubernetes.io/docs/concepts/storage/volumes/#configmap]

Since all 'subPaths' of the ConfigMap are being mounted in both the operator and webhook containers at the same paths, I believe an easy fix would be to avoid declaring individual volumeMounts for each file, and just mount the whole ConfigMap as a volume at /opt/flink/conf.



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