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https://issues.apache.org/jira/browse/SPARK-23082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16331081#comment-16331081
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Anirudh Ramanathan commented on SPARK-23082:
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This is an interesting feature request. We had some discussion about this. I
think it's a bit too late for a feature request in 2.3, so, we can revisit this
in the 2.4 timeframe.
> Allow separate node selectors for driver and executors in Kubernetes
> --------------------------------------------------------------------
>
> Key: SPARK-23082
> URL: https://issues.apache.org/jira/browse/SPARK-23082
> Project: Spark
> Issue Type: Improvement
> Components: Kubernetes, Spark Submit
> Affects Versions: 2.2.0, 2.3.0
> Reporter: Oz Ben-Ami
> Priority: Minor
>
> In YARN, we can use {{spark.yarn.am.nodeLabelExpression}} to submit the Spark
> driver to a different set of nodes from its executors. In Kubernetes, we can
> specify {{spark.kubernetes.node.selector.[labelKey]}}, but we can't use
> separate options for the driver and executors.
> This would be useful for the particular use case where executors can go on
> more ephemeral nodes (eg, with cluster autoscaling, or preemptible/spot
> instances), but the driver should use a more persistent machine.
> The required change would be minimal, essentially just using different config
> keys for the
> [driver|https://github.com/apache/spark/blob/master/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/submit/steps/BasicDriverConfigurationStep.scala#L90]
> and
> [executor|https://github.com/apache/spark/blob/0b2eefb674151a0af64806728b38d9410da552ec/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/scheduler/cluster/k8s/ExecutorPodFactory.scala#L73]
> instead of {{KUBERNETES_NODE_SELECTOR_PREFIX}} for both.
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