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https://issues.apache.org/jira/browse/SPARK-4417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14250260#comment-14250260
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Apache Spark commented on SPARK-4417:
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User 'ilganeli' has created a pull request for this issue:
https://github.com/apache/spark/pull/3723
> New API: sample RDD to fixed number of items
> --------------------------------------------
>
> Key: SPARK-4417
> URL: https://issues.apache.org/jira/browse/SPARK-4417
> Project: Spark
> Issue Type: New Feature
> Components: PySpark, Spark Core
> Reporter: Davies Liu
>
> Sometimes, we just want to a fixed number of items randomly selected from an
> RDD, for example, before sort an RDD we need to gather a fixed number of keys
> from each partitions.
> In order to do this, we need to two pass on the RDD, get the total number,
> then calculate the right ratio for sampling. In fact, we could do this in one
> pass.
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