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https://issues.apache.org/jira/browse/SPARK-5954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14376215#comment-14376215
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Xiangrui Meng commented on SPARK-5954:
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Note: We added topByKey in mllib.rdd.MLPairRDDFunctions instead of in Core.
> Add topByKey to pair RDDs
> -------------------------
>
> Key: SPARK-5954
> URL: https://issues.apache.org/jira/browse/SPARK-5954
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core
> Reporter: Xiangrui Meng
> Assignee: Shuo Xiang
> Fix For: 1.4.0
>
>
> `topByKey(num: Int): RDD[(K, V)]` finds the top-k values for each key in a
> pair RDD. This is used, e.g., in computing top recommendations. We can use
> the Guava implementation of finding top-k from an iterator. See also
> https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/util/collection/Utils.scala.
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