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Posted to issues@spark.apache.org by "Bryan Cutler (JIRA)" <ji...@apache.org> on 2019/05/08 17:42:00 UTC

[jira] [Created] (SPARK-27660) Allow PySpark toLocalIterator to pre-fetch data

Bryan Cutler created SPARK-27660:
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             Summary: Allow PySpark toLocalIterator to pre-fetch data
                 Key: SPARK-27660
                 URL: https://issues.apache.org/jira/browse/SPARK-27660
             Project: Spark
          Issue Type: Improvement
          Components: PySpark
    Affects Versions: 3.0.0
            Reporter: Bryan Cutler


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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