Github user echarles commented on the issue:
https://github.com/apache/spark/pull/21748
> Can you share on how you know that your executor pod has access to your
host set by spark.driver.host and spark.driver.port over the network?
spark.driver.host is set to the hostname of my host (the machine which is
out-cluster - the pod can ping that hostname)
spark.driver.port is set to an arbitrary value, e.g. 7077 like when run
In-Cluster.
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