Victsm commented on a change in pull request #34156:
URL: https://github.com/apache/spark/pull/34156#discussion_r719538616
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File path: core/src/main/scala/org/apache/spark/MapOutputTracker.scala
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@@ -1448,7 +1448,7 @@ private[spark] object MapOutputTracker extends Logging {
// TODO: improve push based shuffle to read partial merged blocks
satisfying the start/end
// TODO: map indexes
if (mergeStatuses.exists(_.nonEmpty) && startMapIndex == 0
- && endMapIndex == mapStatuses.length) {
+ && endMapIndex == mapStatuses.length && endPartition - startPartition ==
1) {
Review comment:
Push based shuffle can work with multiple partitions per reducer.
What it cannot work with is when one shuffle partition gets split between
multiple reducers in the case of skew handling.
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