Github user mateiz commented on a diff in the pull request: https://github.com/apache/spark/pull/1447#discussion_r15042032 --- Diff: core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala --- @@ -216,17 +216,17 @@ class PairRDDFunctions[K, V](self: RDD[(K, V)]) def reducePartition(iter: Iterator[(K, V)]): Iterator[JHashMap[K, V]] = { val map = new JHashMap[K, V] - iter.foreach { case (k, v) => - val old = map.get(k) - map.put(k, if (old == null) v else func(old, v)) + iter.foreach { pair => + val old = map.get(pair._1) --- End diff -- Removing the call to _1 isn't hugely helpful IMO; accessor methods get inlined very fast. However, pattern matching adds a whole bunch of potential throw sites and branches and things like that, and we've noticed problems in the past.
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