Github user liyinan926 commented on the issue:
https://github.com/apache/spark/pull/19717
Actually given that in our implementations the executors talk to the driver
through a Kubernetes headless service that is only created by the submission
client. I don't think any of the two cases above works. So creating a
`SparkContext` directly with a `k8s` url should not be allowed until we find a
way to make it work. @vanzin I'm not sure if there's any precedence for this,
and how this can be enforced. Thoughts or suggestions?
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