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From JoshRosen <>
Subject [GitHub] spark pull request: [SPARK-8735] [WIP] [SQL] Expose memory usage f...
Date Thu, 30 Jul 2015 19:00:38 GMT
Github user JoshRosen commented on a diff in the pull request:
    --- Diff: core/src/main/scala/org/apache/spark/util/collection/ExternalAppendOnlyMap.scala
    @@ -126,7 +131,11 @@ class ExternalAppendOnlyMap[K, V, C](
         while (entries.hasNext) {
           curEntry =
    -      if (maybeSpill(currentMap, currentMap.estimateSize())) {
    +      val estimatedSize = currentMap.estimateSize()
    --- End diff --
    Won't this be really expensive? It looks like this will try to re-estimate the map's size
on each insertion. Does the map make optimizations so that this is cheap?

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