Github user ConeyLiu commented on a diff in the pull request:
https://github.com/apache/spark/pull/19285#discussion_r139917831
--- Diff:
core/src/main/scala/org/apache/spark/storage/memory/MemoryStore.scala ---
@@ -252,7 +250,7 @@ private[spark] class MemoryStore(
if (unrollMemoryUsedByThisBlock <= size) {
--- End diff --
Here the size of underlying vector or bytebuffer maybe greater than the
`unrollMemoryUsedByThisBlock `.
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