Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/11095#discussion_r56636220
--- Diff: core/src/main/java/org/apache/spark/memory/TaskMemoryManager.java
---
@@ -256,7 +261,20 @@ public MemoryBlock allocatePage(long size,
MemoryConsumer consumer) {
}
allocatedPages.set(pageNumber);
}
- final MemoryBlock page =
memoryManager.tungstenMemoryAllocator().allocate(acquired);
+ MemoryBlock page = null;
+ try {
+ page = memoryManager.tungstenMemoryAllocator().allocate(acquired);
+ } catch (OutOfMemoryError e) {
+ logger.warn("Failed to allocate a page ({} bytes), try again.",
acquired);
+ // there is no enough memory actually, it means the actual free
memory is smaller than
+ // MemoryManager thought, we should keep the acquired memory.
+ acquiredButNotUsed += acquired;
+ synchronized (this) {
+ allocatedPages.clear(pageNumber);
+ }
+ // this could trigger spilling to free some pages.
+ return allocatePage(size, consumer);
--- End diff --
I just now saw this commit but:
Is this tail recursion a problem? if you keep running out of memory it
keeps calling itself.
`acquiredButNotUsed += acquired` needs to be synchronized too?
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