Github user zsxwing commented on a diff in the pull request: https://github.com/apache/spark/pull/8931#discussion_r41531452 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/TungstenAggregationIterator.scala --- @@ -690,6 +697,9 @@ class TungstenAggregationIterator( val mapMemory = hashMap.getPeakMemoryUsedBytes val sorterMemory = Option(externalSorter).map(_.getPeakMemoryUsedBytes).getOrElse(0L) val peakMemory = Math.max(mapMemory, sorterMemory) + totalPeakMemory += peakMemory + maxPeakMemory += peakMemory + totalSpilledSize += TaskContext.get().taskMetrics().memoryBytesSpilled - spilledSizeBefore --- End diff -- @andrewor14 is it any place that needs to create multiple threads in a task? Currently, accumulators are not thread-safe. I assume there is only one thread updating accumulators and one thread collecting accumulators' values when running a task. If there are multiple updating threads, we need to make accumulators thread-safe.
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