Github user kayousterhout commented on a diff in the pull request: https://github.com/apache/spark/pull/2504#discussion_r24613511 --- Diff: core/src/main/scala/org/apache/spark/Aggregator.scala --- @@ -54,14 +55,13 @@ case class Aggregator[K, V, C] ( } combiners.iterator } else { - val combiners = new ExternalAppendOnlyMap[K, V, C](createCombiner, mergeValue, mergeCombiners) - combiners.insertAll(iter) - // Update task metrics if context is not null // TODO: Make context non optional in a future release - Option(context).foreach { c => - c.taskMetrics.memoryBytesSpilled += combiners.memoryBytesSpilled - c.taskMetrics.diskBytesSpilled += combiners.diskBytesSpilled - } + val spillMetrics = Option(context).map( + _.taskMetrics.getOrCreateShuffleReadSpillMetrics()).getOrElse(new WriteMetrics()) --- End diff -- If we're doing map-side combining, this should be for the shuffle write, right?
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