Github user mridulm commented on a diff in the pull request: https://github.com/apache/spark/pull/17276#discussion_r108052804 --- Diff: core/src/main/scala/org/apache/spark/shuffle/sort/SortShuffleWriter.scala --- @@ -72,6 +72,27 @@ private[spark] class SortShuffleWriter[K, V, C]( val partitionLengths = sorter.writePartitionedFile(blockId, tmp) shuffleBlockResolver.writeIndexFileAndCommit(dep.shuffleId, mapId, partitionLengths, tmp) mapStatus = MapStatus(blockManager.shuffleServerId, partitionLengths) + + mapStatus match { + case hc: HighlyCompressedMapStatus => + val underestimatedLengths = partitionLengths.filter(_ > hc.getAvgSize) + writeMetrics.incUnderestimatedBlocksSize(underestimatedLengths.sum) + if (log.isDebugEnabled() && partitionLengths.length > 0) { + // Distribution of sizes in MapStatus. + Distribution(partitionLengths.map(_.toDouble)) match { + case Some(distribution) => + val distributionStr = distribution.getQuantiles().mkString(", ") + logDebug(s"For task ${context.partitionId()}.${context.attemptNumber()} in stage" + + s" ${context.stageId()} (TID ${context.taskAttemptId()}), the block sizes in" + + s" MapStatus are inaccurate (average is ${hc.getAvgSize}," + + s" ${underestimatedLengths.length} blocks underestimated, sum of sizes is" + + s" ${underestimatedLengths.sum}), distribution at the given probabilities" + + s" (0, 0.25, 0.5, 0.75, 1.0) is $distributionStr.") + case None => // no-op + } + } --- End diff -- Isn;t this not similar to what is in core/src/main/java/org/apache/spark/shuffle/sort/UnsafeShuffleWriter.java, etc above ? Or is it different ? The code looked same, but written differently (and more expensive here).
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