Erik van Oosten created SPARK-27025:
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Summary: 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
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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