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https://issues.apache.org/jira/browse/SPARK-27659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16909509#comment-16909509
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holdenk commented on SPARK-27659:
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I'm working on this.
> Allow PySpark toLocalIterator to prefetch data
> ----------------------------------------------
>
> Key: SPARK-27659
> URL: https://issues.apache.org/jira/browse/SPARK-27659
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Affects Versions: 3.0.0
> Reporter: Bryan Cutler
> Priority: Minor
>
> In SPARK-23961, data was no longer prefetched so that the local iterator
> could close cleanly in the case of not consuming all of the data. If the user
> intends to iterate over all elements, then prefetching data could bring back
> any lost performance. We would need to run some tests to see if the
> performance is worth it due to additional complexity and extra usage of
> memory. The option to prefetch could adding as a user conf, and it's possible
> this could improve the Scala toLocalIterator also.
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