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https://issues.apache.org/jira/browse/SPARK-5224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14275711#comment-14275711
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Apache Spark commented on SPARK-5224:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/4024
> parallelize list/ndarray is really slow
> ---------------------------------------
>
> Key: SPARK-5224
> URL: https://issues.apache.org/jira/browse/SPARK-5224
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 1.2.0
> Reporter: Davies Liu
> Priority: Blocker
>
> After the default batchSize changed to 0 (batched based on the size of
> object), but parallelize() still use BatchedSerializer with batchSize=1.
> Also, BatchedSerializer did not work well with list and numpy.ndarray
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