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https://issues.apache.org/jira/browse/SPARK-20268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15962098#comment-15962098
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Hayri Volkan Agun commented on SPARK-20268:
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Hi Owen,
If the first element is the fastest let's close it.
> Arbitrary RDD element (Fast return) instead of using first
> ----------------------------------------------------------
>
> Key: SPARK-20268
> URL: https://issues.apache.org/jira/browse/SPARK-20268
> Project: Spark
> Issue Type: Improvement
> Components: ML, Spark Core
> Affects Versions: 2.0.0, 2.0.1, 2.1.0
> Reporter: Hayri Volkan Agun
> Priority: Minor
>
> Most of the ML and MLLIB algorithms somehow need the column size of the rdd
> vector (RDD[Vector]). So instead of getting the first element by rdd.first(),
> a fast return can be made to calculate the length of the vector of a
> arbitrary rdd element. It can also be be named any().
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