Daryn Sharp created HADOOP-9856:
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Summary: Avoid Krb5LoginModule.logout issue
Key: HADOOP-9856
URL: https://issues.apache.org/jira/browse/HADOOP-9856
Project: Hadoop Common
Issue Type: Sub-task
Components: security
Affects Versions: 2.0.0-alpha, 3.0.0
Reporter: Daryn Sharp
Assignee: Daryn Sharp
The kerberos login module's logout method arguably has a bug.
{{Subject#getPrivateCredentials()}} returns a synchronized set. Iterating the
set requires explicitly locking the set. The {{Krb5LoginModule#logout()}} is
iterating and modifying the set w/o a lock. This may lead to a
{{ConcurrentModificationException}} which is what lead to
{{UGI.getCurrentUser()}} being unnecessarily synchronized.
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