Github user ConeyLiu commented on a diff in the pull request:
https://github.com/apache/spark/pull/19316#discussion_r144169752
--- Diff:
core/src/main/scala/org/apache/spark/storage/memory/MemoryStore.scala ---
@@ -388,7 +388,13 @@ private[spark] class MemoryStore(
// perform one final call to attempt to allocate additional memory if
necessary.
if (keepUnrolling) {
serializationStream.close()
- reserveAdditionalMemoryIfNecessary()
+ if (bbos.size > unrollMemoryUsedByThisBlock) {
+ val amountToRequest = bbos.size - unrollMemoryUsedByThisBlock
--- End diff --
Because we request `val amountToRequest = (bbos.size * memoryGrowthFactor -
unrollMemoryUsedByThisBlock).toLong` in `reserveAdditionalMemoryIfNecessary `
to avoid requesting for every records. But here we just need request the
precise memory for the last request.
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