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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9856) Avoid Krb5LoginModule.logout issue
Date Fri, 09 Aug 2013 17:42:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13735042#comment-13735042
] 

Alejandro Abdelnur commented on HADOOP-9856:
--------------------------------------------

[~daryn] your prayers are about to be answered very soon, HADOOP-9848.
                
> 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
>         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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