Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/16196#discussion_r91309138
--- Diff: core/src/main/scala/org/apache/spark/util/SizeEstimator.scala ---
@@ -89,7 +90,13 @@ object SizeEstimator extends Logging {
// A cache of ClassInfo objects for each class
// We use weakKeys to allow GC of dynamically created classes
- private val classInfos = new MapMaker().weakKeys().makeMap[Class[_],
ClassInfo]()
+ private val classInfos = new ThreadLocal[WeakHashMap[Class[_],
ClassInfo]] {
+ override def initialValue(): java.util.WeakHashMap[Class[_],
ClassInfo] = {
+ val toReturn = new WeakHashMap[Class[_], ClassInfo]()
+ toReturn.put(classOf[Object], new ClassInfo(objectSize, new
Array[Int](0)))
+ return toReturn
--- End diff --
What I meant was, continue to use ThreadLocal, but maintain the MapMaker's
result for thlocal.get()
And move the initilization to initialize() instead of in initialValue()
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