Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/2890#discussion_r19197345
--- Diff:
core/src/main/scala/org/apache/spark/util/collection/ExternalSorter.scala ---
@@ -259,7 +264,7 @@ private[spark] class ExternalSorter[K, V, C](
private def spillToMergeableFile(collection:
SizeTrackingPairCollection[(Int, K), C]): Unit = {
assert(!bypassMergeSort)
- val (blockId, file) = diskBlockManager.createTempBlock()
+ val (blockId, file) = diskBlockManager.createTempShuffleBlock()
--- End diff --
Could you add a detailed comment here to explain that this needs to be a
temp shuffle block because the read side expects to read this back with
`spark.shuffle.compress` instead of `spark.shuffle.spill.compress`? I think
it's worth including the JIRA number in the comments too.
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