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https://issues.apache.org/jira/browse/SPARK-29762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16972755#comment-16972755
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Thomas Graves commented on SPARK-29762:
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But like you mention, if we were to support something like that, then the 
default of 1 when task requirement wasn't specified would be an issue.  

> GPU Scheduling - default task resource amount to 1
> --------------------------------------------------
>
>                 Key: SPARK-29762
>                 URL: https://issues.apache.org/jira/browse/SPARK-29762
>             Project: Spark
>          Issue Type: Story
>          Components: Spark Core
>    Affects Versions: 3.0.0
>            Reporter: Thomas Graves
>            Priority: Major
>
> Default the task level resource configs (for gpu/fpga, etc) to 1.  So if the 
> user specifies the executor resource then to make it more user friendly lets 
> have the task resource config default to 1.  This is ok right now since we 
> require resources to have an address.  It also matches what we do for the 
> spark.task.cpus configs.



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