Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/9610#discussion_r44748721
--- Diff:
core/src/main/scala/org/apache/spark/shuffle/sort/SortShuffleWriter.scala ---
@@ -65,11 +66,11 @@ private[spark] class SortShuffleWriter[K, V, C](
// Don't bother including the time to open the merged output file in
the shuffle write time,
// because it just opens a single file, so is typically too fast to
measure accurately
// (see SPARK-3570).
- val outputFile = shuffleBlockResolver.getDataFile(dep.shuffleId, mapId)
+ val output = shuffleBlockResolver.getDataFile(dep.shuffleId, mapId)
+ val tmp = Utils.tempFileWith(output)
--- End diff --
This is only one file `output` here, I think it's obvious
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