karuppayya commented on code in PR #52606:
URL: https://github.com/apache/spark/pull/52606#discussion_r2430910397
##########
core/src/main/scala/org/apache/spark/storage/BlockManagerStorageEndpoint.scala:
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@@ -57,7 +57,14 @@ class BlockManagerStorageEndpoint(
case RemoveShuffle(shuffleId) =>
doAsync[Boolean](log"removing shuffle ${MDC(SHUFFLE_ID, shuffleId)}",
context) {
- if (mapOutputTracker != null) {
+ if (mapOutputTracker != null &&
!mapOutputTracker.isInstanceOf[MapOutputTrackerMaster]) {
+ // SPARK-53898: `MapOutputTrackerMaster.unregisterShuffle()` should
only be called
+ // through `ContextCleaner` when the shuffle is considered no longer
referenced anywhere.
+ // Otherwise, we might hit exceptions if there is any subsequent
access (which still
+ // reference that shuffle) to that shuffle metadata in
`MapOutputTrackerMaster`. E.g.,
+ // an ongoing subquery could access the same shuffle metadata which
could have been
Review Comment:
The main query has ended already. The subqueries results are anyway not
going to be used (and is also a waste of resource in allowing it to continue).
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