Github user liyinan926 commented on the issue:
https://github.com/apache/spark/pull/22433
Agreed with @mridulm that the naming restriction is specific to k8s and
should be handled in a k8s specific way, e.g., somewhere around
https://github.com/apache/spark/blob/master/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/submit/KubernetesClientApplication.scala#L208.
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