Ngone51 commented on a change in pull request #34156:
URL: https://github.com/apache/spark/pull/34156#discussion_r719450502
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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:
~~Not push-based shuffle, but batch fetch is still doable, right?~~
So if "both conditions" refers to "endPartition - startPartition == 1" &
"disable batch fetch", I'd say we'd end up not using batch fetch for coalasced
partitions. And in anyways, push-based shuffle should not be used for coalasced
partitions as it could contain multiple reduce partitions.
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