Github user mridulm commented on a diff in the pull request: https://github.com/apache/spark/pull/16196#discussion_r91268937 --- 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 -- Why not keep the returned value same as before ? And move the initialization back into initialize() - so that use of classInfos Map across threads wont happen.
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