Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19135#discussion_r139047702
--- Diff:
core/src/main/scala/org/apache/spark/storage/memory/MemoryStore.scala ---
@@ -325,6 +325,10 @@ private[spark] class MemoryStore(
// Whether there is still enough memory for us to continue unrolling
this block
var keepUnrolling = true
+ // Number of elements unrolled so far
+ var elementsUnrolled = 0L
+ // How often to check whether we need to request more memory
+ val memoryCheckPeriod = 16
--- End diff --
it's hard coded in `putIteratorAsValues` too, we can improve it later.
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