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https://issues.apache.org/jira/browse/SPARK-9399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14643921#comment-14643921
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Apache Spark commented on SPARK-9399:
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User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/7719
> Assorted micro-optimizations in PythonRDD
> -----------------------------------------
>
> Key: SPARK-9399
> URL: https://issues.apache.org/jira/browse/SPARK-9399
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Reporter: Josh Rosen
> Assignee: Josh Rosen
> Priority: Minor
>
> There are a few minor optimizations in PythonRDD which may avoid garbage
> creation or Scala overheads:
> - Replace a foreach() loop with a while() loop.
> - Returns nulls instead of Options to avoid allocating an Option once per
> read() call.
> - Call .size() instead of .length(), thereby avoiding an implicit Java ->
> Scala collections conversion.
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