Github user andrewor14 commented on a diff in the pull request: https://github.com/apache/spark/pull/7403#discussion_r38458181 --- Diff: core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala --- @@ -565,12 +603,25 @@ class PairRDDFunctions[K, V](self: RDD[(K, V)]) } /** - * Simplified version of combineByKey that hash-partitions the resulting RDD using the - * existing partitioner/parallelism level. + * This method is here for backward compatibility. It + * does not provide combiner classtag information to + * the shuffle. + * + * @see [[combineByKeyWithClassTag]] */ def combineByKey[C](createCombiner: V => C, mergeValue: (C, V) => C, mergeCombiners: (C, C) => C) - : RDD[(K, C)] = self.withScope { - combineByKey(createCombiner, mergeValue, mergeCombiners, defaultPartitioner(self)) + : RDD[(K, C)] = { + combineByKeyWithClassTag(createCombiner, mergeValue, mergeCombiners)(null) + } + + /** + * Simplified version of combineByKeyWithClassTag that hash-partitions the resulting RDD using the + * existing partitioner/parallelism level. + */ + def combineByKeyWithClassTag[C](createCombiner: V => C, mergeValue: (C, V) => C, + mergeCombiners: (C, C) => C) --- End diff -- style: ``` def combineByKeyWithClassTag[C]( createCombiner: V => C, mergeValue: (C, V) => C, mergeCombiners: (C, C) => C)(implicit ct: ClassTag[C]): RDD[(K, C)] = self.withScope { ... } ```
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