Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/16196#discussion_r91375333 --- Diff: core/src/main/scala/org/apache/spark/util/SizeEstimator.scala --- @@ -316,62 +338,40 @@ object SizeEstimator extends Logging { */ private def getClassInfo(cls: Class[_]): ClassInfo = { // Check whether we've already cached a ClassInfo for this class - val info = classInfos.get(cls) + val info = classInfos.get().get(cls) if (info != null) { return info } val parent = getClassInfo(cls.getSuperclass) + val fields = cls.getDeclaredFields + val fieldCount = fields.length var shellSize = parent.shellSize - var pointerFields = parent.pointerFields - val sizeCount = Array.fill(fieldSizes.max + 1)(0) + var fieldOffsets = parent.fieldOffsets.toList + + var index = 0 - // iterate through the fields of this class and gather information. - for (field <- cls.getDeclaredFields) { + while (index < fieldCount) { + val field = fields(index) if (!Modifier.isStatic(field.getModifiers)) { val fieldClass = field.getType if (fieldClass.isPrimitive) { - sizeCount(primitiveSize(fieldClass)) += 1 + if (cls == classOf[Double] || cls == classOf[Long]) { --- End diff -- This and the logic changes below aren't obviously OK. this seems to lose a lot of logic. I think this has to be explained or backed out
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