Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/1450#discussion_r15038311
--- Diff: core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala
---
@@ -361,11 +361,11 @@ class PairRDDFunctions[K, V](self: RDD[(K, V)])
// groupByKey shouldn't use map side combine because map side combine
does not
// reduce the amount of data shuffled and requires all map side data
be inserted
// into a hash table, leading to more objects in the old gen.
- def createCombiner(v: V) = ArrayBuffer(v)
--- End diff --
We should change all of them actually. I will update the PR.
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