Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/6625#discussion_r31776620
--- Diff:
core/src/main/scala/org/apache/spark/serializer/SerializationDebugger.scala ---
@@ -145,17 +151,50 @@ private[spark] object SerializationDebugger extends
Logging {
// An object contains multiple slots in serialization.
// Get the slots and visit fields in all of them.
val (finalObj, desc) = findObjectAndDescriptor(o)
+
+ // If the object has been replaced using writeReplace(),
+ // then call visit() on it again to test its type again.
+ if (!finalObj.eq(o)) {
+ return visit(finalObj, s"writeReplace data (class:
${finalObj.getClass.getName})" :: stack)
+ }
+
+ // Every class is associated with one or more "slots", each slot is
related to the parent
+ // classes of this class. These slots are used by the
ObjectOutputStream
--- End diff --
grammar nit: each slot refers to the parent class of this class
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