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From "Erik van Oosten (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-27025) Speed up toLocalIterator
Date Fri, 01 Mar 2019 16:10:00 GMT
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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