Karn Kumar Singh created HDDS-11424:
---------------------------------------

             Summary: NullPointerException encountered during execution of 
'ozone dtutil cancel' command
                 Key: HDDS-11424
                 URL: https://issues.apache.org/jira/browse/HDDS-11424
             Project: Apache Ozone
          Issue Type: Bug
            Reporter: Karn Kumar Singh


I tried executing the 'ozone dtutil cancel' command and encountered 
NullPointerException.

*Repro step:* 
 # Create a token using the "ozone dtutil get" command and pass the hdfs scheme.
 # Cancel one of the aliases using the 'ozone dtutil cancel' command of the 
token file.

*Log:* 
{code:java}
# ozone dtutil get hdfs://ns1 -alias test -renewer hdfs bug_ozone
24/09/05 15:15:42 INFO hdfs.DFSClient: Created token for hdfs: 
HDFS_DELEGATION_TOKEN [email protected], renewer=hdfs, realUser=, 
issueDate=1725549342888, maxDate=1726154142888, sequenceNumber=15, 
masterKeyId=11 on ha-hdfs:ns1
24/09/05 15:15:42 INFO token.DtFileOperations: Add token with service test
# ozone dtutil print bug_ozone
File: bug_ozone
Token kind               Service              Renewer         Exp date     URL 
enc token
--------------------------------------------------------------------------------
HDFS_DELEGATION_TOKEN    ha-hdfs:ns1          hdfs            9/12/24, 3:15 PM 
*****************
HDFS_DELEGATION_TOKEN    test                 hdfs            9/12/24, 3:15 PM 
*****************
# ozone dtutil cancel -alias test bug_ozone
dtutil cancel -alias <alias> [-format (java|protobuf)] filename...
java.lang.NullPointerException
    at 
org.apache.hadoop.security.authentication.util.KerberosName.getShortName(KerberosName.java:422)
    at org.apache.hadoop.security.User.<init>(User.java:48)
    at org.apache.hadoop.security.User.<init>(User.java:43)
    at 
org.apache.hadoop.security.UserGroupInformation.createRemoteUser(UserGroupInformation.java:1418)
    at 
org.apache.hadoop.security.UserGroupInformation.createRemoteUser(UserGroupInformation.java:1402)
    at 
org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier.getUser(AbstractDelegationTokenIdentifier.java:80)
    at 
org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier.getUser(DelegationTokenIdentifier.java:81)
    at 
org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier.toString(DelegationTokenIdentifier.java:91)
    at java.base/java.lang.String.valueOf(String.java:2951)
    at java.base/java.lang.StringBuilder.append(StringBuilder.java:168)
    at 
org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier.stringifyToken(DelegationTokenIdentifier.java:123)
    at org.apache.hadoop.hdfs.DFSClient$Renewer.cancel(DFSClient.java:804)
    at org.apache.hadoop.security.token.Token.cancel(Token.java:527)
    at 
org.apache.hadoop.security.token.DtFileOperations.removeTokenFromFile(DtFileOperations.java:283)
    at 
org.apache.hadoop.security.token.DtUtilShell$Remove.execute(DtUtilShell.java:320)
    at org.apache.hadoop.tools.CommandShell.run(CommandShell.java:72)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:81)
    at org.apache.hadoop.security.token.DtUtilShell.main(DtUtilShell.java:361)
# ozone dtutil remove -alias test bug_ozone
# ozone dtutil print bug_ozone
File: bug_ozone
Token kind               Service              Renewer         Exp date     URL 
enc token
--------------------------------------------------------------------------------
HDFS_DELEGATION_TOKEN    ha-hdfs:ns1          hdfs            9/12/24, 3:15 PM 
*****************
# ozone dtutil cancel -alias ha-hdfs:ns1 bug_ozone
dtutil cancel -alias <alias> [-format (java|protobuf)] filename...
java.lang.NullPointerException
    at 
org.apache.hadoop.security.authentication.util.KerberosName.getShortName(KerberosName.java:422)
    at org.apache.hadoop.security.User.<init>(User.java:48)
    at org.apache.hadoop.security.User.<init>(User.java:43)
    at 
org.apache.hadoop.security.UserGroupInformation.createRemoteUser(UserGroupInformation.java:1418)
    at 
org.apache.hadoop.security.UserGroupInformation.createRemoteUser(UserGroupInformation.java:1402)
    at 
org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier.getUser(AbstractDelegationTokenIdentifier.java:80)
    at 
org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier.getUser(DelegationTokenIdentifier.java:81)
    at 
org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier.toString(DelegationTokenIdentifier.java:91)
    at java.base/java.lang.String.valueOf(String.java:2951)
    at java.base/java.lang.StringBuilder.append(StringBuilder.java:168)
    at 
org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier.stringifyToken(DelegationTokenIdentifier.java:123)
    at org.apache.hadoop.hdfs.DFSClient$Renewer.cancel(DFSClient.java:804)
    at org.apache.hadoop.security.token.Token.cancel(Token.java:527)
    at 
org.apache.hadoop.security.token.DtFileOperations.removeTokenFromFile(DtFileOperations.java:283)
    at 
org.apache.hadoop.security.token.DtUtilShell$Remove.execute(DtUtilShell.java:320)
    at org.apache.hadoop.tools.CommandShell.run(CommandShell.java:72)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:81)
    at org.apache.hadoop.security.token.DtUtilShell.main(DtUtilShell.java:361)  
{code}



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