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https://issues.apache.org/jira/browse/SPARK-23285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16425206#comment-16425206
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Felix Cheung commented on SPARK-23285:
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fixed in 2.3, updating.
> Allow spark.executor.cores to be fractional
> -------------------------------------------
>
> Key: SPARK-23285
> URL: https://issues.apache.org/jira/browse/SPARK-23285
> Project: Spark
> Issue Type: Improvement
> Components: Kubernetes, Scheduler, Spark Submit
> Affects Versions: 2.4.0
> Reporter: Anirudh Ramanathan
> Assignee: Yinan Li
> Priority: Minor
> Fix For: 2.4.0
>
>
> There is a strong check for an integral number of cores per executor in
> [SparkSubmitArguments.scala#L270-L272|https://github.com/apache/spark/blob/3f4060c340d6bac412e8819c4388ccba226efcf3/core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala#L270-L272].
> Given we're reusing that property in K8s, does it make sense to relax it?
>
> K8s treats CPU as a "compressible resource" and can actually assign millicpus
> to individual containers. Also to be noted - spark.driver.cores has no such
> check in place.
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