Oz Ben-Ami created SPARK-23082:
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Summary: 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
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 in
[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
[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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