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https://issues.apache.org/jira/browse/SPARK-5858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14323987#comment-14323987
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Apache Spark commented on SPARK-5858:
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User 'mengxr' has created a pull request for this issue:
https://github.com/apache/spark/pull/4647
> Using first() to get feature size causes performance regression
> ---------------------------------------------------------------
>
> Key: SPARK-5858
> URL: https://issues.apache.org/jira/browse/SPARK-5858
> Project: Spark
> Issue Type: Bug
> Components: MLlib, PySpark
> Affects Versions: 1.3.0
> Reporter: Xiangrui Meng
> Assignee: Xiangrui Meng
> Priority: Critical
>
> We call `.first()` to get the feature size. It causes performance regression
> because first() still runs on the driver.
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