LuciferYang commented on code in PR #50489:
URL: https://github.com/apache/spark/pull/50489#discussion_r2041103661


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core/src/main/scala/org/apache/spark/serializer/SerializationDebugger.scala:
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@@ -110,8 +112,13 @@ private[spark] object SerializationDebugger extends 
Logging {
             val elem = s"externalizable object (class ${e.getClass.getName}, 
$e)"
             visitExternalizable(e, elem :: stack)
 
-          case s: Object with java.io.Serializable =>
-            val elem = s"object (class ${s.getClass.getName}, $s)"
+          case s: Object with java.io.Serializable if Utils.isTesting =>

Review Comment:
   hmm... currently, no similar cases have been created in non-testing 
scenarios, right? @summaryzb 



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