viirya commented on a change in pull request #23272: [SPARK-26265][Core] Fix
deadlock in BytesToBytesMap.MapIterator when locking both
BytesToBytesMap.MapIterator and TaskMemoryManager
URL: https://github.com/apache/spark/pull/23272#discussion_r240503360
##########
File path: core/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java
##########
@@ -283,6 +290,9 @@ private void advanceToNextPage() {
}
}
}
+ if (pageToFree != null) {
+ freePage(pageToFree);
Review comment:
The page to free (`currentPage`) is removed from `dataPages` and advanced to
next page when locking on the `MapIterator` object. The locking will prevent
the same page to be freed by calling `spill` at another consumer.
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