[jira] [Created] (HADOOP-19744) Improve SubjectUtil.checkThreadInheritsSubject

["Istvan Toth (Jira)" <ji...@apache.org>]

Istvan Toth created HADOOP-19744:
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             Summary: Improve SubjectUtil.checkThreadInheritsSubject
                 Key: HADOOP-19744
                 URL: https://issues.apache.org/jira/browse/HADOOP-19744
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Istvan Toth


While the code, it causes Hadoop to emit warnings 

{noformat}
WARNING: A terminally deprecated method in java.lang.System has been called
WARNING: System::setSecurityManager has been called by org.apache.hadoop.security.authentication.util.SubjectUtil (file:/Users/stevel/.m2/repository/org/apache/hadoop/hadoop-auth/3.5.0-SNAPSHOT/hadoop-auth-3.5.0-SNAPSHOT.jar)
WARNING: Please consider reporting this to the maintainers of org.apache.hadoop.security.authentication.util.SubjectUtil
{noformat}

The SecurityManager check is only really needed for Java 22-23. 

We  shortcut the check by returning true for JDK21 and earlier and false for JDK24 and later, and only check and emit warnings  for 22-23, which are EOL anyway.

We can also try to duplicate the logic the JVM uses to determine whether SecurityManager is enabled without explicitly calling it, but that would be less robust than the current check.




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