Github user jerryshao commented on a diff in the pull request: https://github.com/apache/spark/pull/19788#discussion_r152891792 --- Diff: core/src/main/scala/org/apache/spark/MapOutputTracker.scala --- @@ -812,10 +812,13 @@ private[spark] object MapOutputTracker extends Logging { logError(errorMessage) throw new MetadataFetchFailedException(shuffleId, startPartition, errorMessage) } else { + var totalSize = 0L for (part <- startPartition until endPartition) { - splitsByAddress.getOrElseUpdate(status.location, ArrayBuffer()) += - ((ShuffleBlockId(shuffleId, mapId, part), status.getSizeForBlock(part))) + totalSize += status.getSizeForBlock(part) --- End diff -- This can be simplified like: `val totalSize = (startPartition until endPartition).map(status.getSizeForXXX).sum`.
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