[
https://issues.apache.org/jira/browse/HADOOP-19275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17881809#comment-17881809
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ASF GitHub Bot commented on HADOOP-19275:
-----------------------------------------
devabhishekpal opened a new pull request, #7045:
URL: https://github.com/apache/hadoop/pull/7045
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### Description of PR
The hadoop dtutil cancel command gives NullPointerException.
```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)
```
This is because it is trying to create a User and in User.java we are
calling
[this](https://github.com/apache/hadoop/blob/ea6e0f7cd58d0129897dfc7870aee188be80a904/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/User.java#L48)
line.
But due to this direct call it doesn't initialize the auth_to_local rules
and causes NPE in
[here](https://github.com/apache/hadoop/blob/ea6e0f7cd58d0129897dfc7870aee188be80a904/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/util/KerberosName.java#L422)
in KerberosName.java
This patch addresses this issue.
### How was this patch tested?
This patch was tested manually by creating a cluster and running the
commands to verify the Delegation Token is cancelled
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
> dtutil cancel command fails with NullPointerException
> -----------------------------------------------------
>
> Key: HADOOP-19275
> URL: https://issues.apache.org/jira/browse/HADOOP-19275
> Project: Hadoop Common
> Issue Type: Bug
> Components: common
> Reporter: Abhishek Pal
> Assignee: Abhishek Pal
> Priority: Major
>
> The hadoop dtutil cancel command gives NullPointerException.
> {code}
> 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}
> This is because it is trying to create a User and in User.java we are calling
> [this|https://github.com/apache/hadoop/blob/ea6e0f7cd58d0129897dfc7870aee188be80a904/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/User.java#L48]
> line.
> But due to this direct call it doesn't initialize the auth_to_local rules and
> causes NPE in
> [here|https://github.com/apache/hadoop/blob/ea6e0f7cd58d0129897dfc7870aee188be80a904/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/util/KerberosName.java#L422]
> in KerberosName.java
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