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https://issues.apache.org/jira/browse/SPARK-2046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-2046.
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Resolution: Won't Fix
> Support config properties that are changeable across tasks/stages within a job
> ------------------------------------------------------------------------------
>
> Key: SPARK-2046
> URL: https://issues.apache.org/jira/browse/SPARK-2046
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Zongheng Yang
>
> Suppose an application consists of multiple stages, where some stages contain
> computation-intensive tasks, and other stages contain less
> computation-intensive (or otherwise ordinary) tasks.
> For such job to run efficiently, it might make sense to provide user a
> function to set "spark.task.cpus" to a high number right before the
> computation-intensive stages/tasks are getting generated in the user code,
> and set the property to a lower number for other stages/tasks.
> As a first step, supporting this feature across stages instead of the more
> fine-grained task-level might suffice.
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