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Posted to common-issues@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2017/08/18 17:49:01 UTC
[jira] [Resolved] (HADOOP-9856) Avoid Krb5LoginModule.logout issue
[ https://issues.apache.org/jira/browse/HADOOP-9856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Daryn Sharp resolved HADOOP-9856.
---------------------------------
Resolution: Duplicate
Release Note: Incorporated into parent jira.
> 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-alpha1
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HADOOP-9856.patch
>
>
> 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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