10110346 commented on a change in pull request #23679: [SPARK-23516][CORE] It
is unnecessary to transfer unroll memory to storage memory
URL: https://github.com/apache/spark/pull/23679#discussion_r251697130
##########
File path:
core/src/main/scala/org/apache/spark/storage/memory/MemoryStore.scala
##########
@@ -247,18 +247,18 @@ private[spark] class MemoryStore(
val amountToRequest = size - unrollMemoryUsedByThisBlock
keepUnrolling = reserveUnrollMemoryForThisTask(blockId,
amountToRequest, memoryMode)
if (keepUnrolling) {
- unrollMemoryUsedByThisBlock += amountToRequest
+ unrollMemoryUsedByThisBlock = size
}
+ } else if (size < unrollMemoryUsedByThisBlock) {
+ releaseUnrollMemoryForThisTask(memoryMode, unrollMemoryUsedByThisBlock
- size)
+ unrollMemoryUsedByThisBlock = size
}
if (keepUnrolling) {
val entry = entryBuilder.build()
- // Synchronize so that transfer is atomic
- memoryManager.synchronized {
- releaseUnrollMemoryForThisTask(memoryMode,
unrollMemoryUsedByThisBlock)
- val success = memoryManager.acquireStorageMemory(blockId,
entry.size, memoryMode)
- assert(success, "transferring unroll memory to storage memory
failed")
- }
+ // In fact, unroll memory is also storage memory, it is unnecessary to
+ // release unroll memory really, and then to get storage memory again.
+ releaseUnrollMemoryForThisTask(memoryMode,
unrollMemoryUsedByThisBlock, false)
Review comment:
Yeah,thanks
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