venkata91 commented on a change in pull request #34156:
URL: https://github.com/apache/spark/pull/34156#discussion_r720708492
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File path: core/src/main/scala/org/apache/spark/MapOutputTracker.scala
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@@ -1447,8 +1451,9 @@ private[spark] object MapOutputTracker extends Logging {
// TODO: SPARK-35036: Instead of reading map blocks in case of AQE with
Push based shuffle,
// 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) {
+ if (mergeStatuses.exists(_.nonEmpty) && mergeStatuses.exists(_.exists(_ !=
null))
Review comment:
Ideally we can avoid doing this costly check by checking
`numAvailableMergeResults` and setting this `mergeStatuses` to `None` before
passing to `convertMapStatuses`. But may be we can do that as a follow-up as a
separate PR .
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