arunreddyav commented on code in PR #8054:
URL: https://github.com/apache/hadoop/pull/8054#discussion_r2518849663


##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/AbstractDelegationTokenSecretManager.java:
##########
@@ -858,7 +858,11 @@ private void removeExpiredToken() throws IOException {
         long renewDate = entry.getValue().getRenewDate();
         if (renewDate < now) {
           expiredTokens.add(entry.getKey());
-          removeTokenForOwnerStats(entry.getKey());
+          try {
+            removeTokenForOwnerStats(entry.getKey());

Review Comment:
   Thanks for the review, @surendralilhore.
   `entry.getKey().getRealUser().toString()` will be empty for older realm 
tokens, so this approach may not work in those cases.



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