mccheah commented on issue #24879: [SPARK-28042][K8S] Support using hostpath volume mount as local storage URL: https://github.com/apache/spark/pull/24879#issuecomment-505228641 So my impression was that hostPath volumes are unsafe because they break the boundary of isolation between the container and the underlying machine, and the isolation between containers. I also was under the impression that containers have to be run as root to support hostPath volumes. Because of these factors I would be hesitant to advertise supporting this as a first-class feature in the Spark on Kubernetes integration. If a user so desired they can use the existing pod template feature to break glass, and this seems more like a break glass feature in my estimation.
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