steveloughran commented on code in PR #7005:
URL: https://github.com/apache/hadoop/pull/7005#discussion_r1721637057


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hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/sasl/CustomizedCallbackHandler.java:
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@@ -34,6 +36,24 @@ public void handleCallback(List<Callback> callbacks, String 
username, char[] pas
     }
   }
 
+  static CustomizedCallbackHandler delegate(Object delegated) {

Review Comment:
   As of last week, DynMethod exists in hadoop common to assist here. Have look 
to see if it would help or are your needs better. A key aspect is can extract 
IOEs from the invocation



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