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https://issues.apache.org/jira/browse/SPARK-27025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16782322#comment-16782322
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Erik van Oosten commented on SPARK-27025:
-----------------------------------------
I have a program in which several steps need to be executed before anything can
be transferred to the driver. So why can't the executors start executing
immediately, and only transfer the results to the driver when its ready?
> Speed up toLocalIterator
> ------------------------
>
> Key: SPARK-27025
> URL: https://issues.apache.org/jira/browse/SPARK-27025
> Project: Spark
> Issue Type: Wish
> Components: Spark Core
> Affects Versions: 2.3.3
> Reporter: Erik van Oosten
> Priority: Major
>
> Method {{toLocalIterator}} fetches the partitions to the driver one by one.
> However, as far as I can see, any required computation for the
> yet-to-be-fetched-partitions is not kicked off until it is fetched.
> Effectively only one partition is being computed at the same time.
> Desired behavior: immediately start calculation of all partitions while
> retaining the download-a-partition at a time behavior.
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