Github user erikerlandson commented on the issue:
https://github.com/apache/spark/pull/19995
I'm picking up a few stragglers from `git grep`
```
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/submit/steps/BaseDriverConfigurationStep.scala
33=private[spark] class BaseDriverConfigurationStep(
49: private val driverDockerImage = submissionSparkConf
51: .getOrElse(throw new SparkException("Must specify the driver Docker
image"))
113: .withImage(driverDockerImage)
```
```
core/src/test/scala/org/apache/spark/deploy/SparkSubmitSuite.scala
95=class SparkSubmitSuite
399: "--conf", "spark.kubernetes.driver.docker.image=bar",
415: conf.get("spark.kubernetes.driver.docker.image") should be ("bar")
```
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