jerqi commented on code in PR #6778:
URL: https://github.com/apache/gravitino/pull/6778#discussion_r2020345133


##########
server-common/src/main/java/org/apache/gravitino/server/authentication/KerberosAuthenticator.java:
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@@ -171,13 +169,7 @@ private Principal retrievePrincipalFromToken(String 
serverPrincipal, byte[] clie
       }
 
       // Usually principal names are in the form 'user/instance@REALM' or 
'user@REALM'.

Review Comment:
   I learned some resources about Kerberos. They tell me that the instance is 
only optional. It seems that you realm is optional. Is it correct usage for 
Kerberos principal? Could you give some background knowlege of your usage?



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