Github user aarondav commented on a diff in the pull request:
https://github.com/apache/incubator-spark/pull/623#discussion_r9930713
--- Diff: core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala
---
@@ -77,6 +77,7 @@ class PairRDDFunctions[K: ClassTag, V: ClassTag](self:
RDD[(K, V)])
partitioner: Partitioner,
mapSideCombine: Boolean = true,
serializerClass: String = null): RDD[(K, C)] = {
+ require(mergeCombiners != null, "mergeCombiners must be defined") //
required as of Spark 0.9.0
--- End diff --
fyi: this line is <100ch.
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