Xiangrui Meng created SPARK-5954:
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Summary: 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
`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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