srowen commented on a change in pull request #23866: [SPARK-26963][MLLIB]
SizeEstimator can't make some JDK fields accessible in Java 9+
URL: https://github.com/apache/spark/pull/23866#discussion_r259217709
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File path: core/src/main/scala/org/apache/spark/util/SizeEstimator.scala
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@@ -334,9 +334,21 @@ object SizeEstimator extends Logging {
if (fieldClass.isPrimitive) {
sizeCount(primitiveSize(fieldClass)) += 1
} else {
- field.setAccessible(true) // Enable future get()'s on this field
+ // Note: in Java 9+ this would be better with trySetAccessible and
canAccess
+ try {
+ field.setAccessible(true) // Enable future get()'s on this field
+ pointerFields = field :: pointerFields
+ } catch {
+ // If the field isn't accessible, we can still record the pointer
size
+ // but can't know more about the field, so ignore it
+ case _: SecurityException =>
+ // do nothing
+ // Java 9+ can throw InaccessibleObjectException but the class is
Java 9+-only
+ case re: RuntimeException
+ if re.getClass.getSimpleName == "InaccessibleObjectException"
=>
Review comment:
The exception would just propagate, as before, if it's not matched by either
case. That's what we want, if something else goes wrong.
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