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https://issues.apache.org/jira/browse/SPARK-10223?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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holdenk closed SPARK-10223.
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Resolution: Won't Fix
I don't see this feature being particularly popular, especially since its
relatively easy to implement outside of Spark its self. If you disagree feel
free to re-open this.
> Add takeOrderedByKey function to extract top N records within each group
> ------------------------------------------------------------------------
>
> Key: SPARK-10223
> URL: https://issues.apache.org/jira/browse/SPARK-10223
> Project: Spark
> Issue Type: New Feature
> Components: PySpark
> Reporter: Ritesh Agrawal
> Priority: Minor
>
> Currently PySpark has takeOrdered function that returns top N records.
> However often you want to extract top N records within each group. This can
> be easily implemented using combineByKey operation and using fixed size heap
> to capture top N within each group. A working solution can be found over
> [here](https://ragrawal.wordpress.com/2015/08/25/pyspark-top-n-records-in-each-group/)
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