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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10489) UserGroupInformation#getTokens and UserGroupInformation#addToken can lead to ConcurrentModificationException
Date Mon, 19 May 2014 19:53:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14002256#comment-14002256
] 

Aaron T. Myers commented on HADOOP-10489:
-----------------------------------------

Thanks a lot for the additional review, Daryn.

I'm going to commit this momentarily.

> UserGroupInformation#getTokens and UserGroupInformation#addToken can lead to ConcurrentModificationException
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-10489
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10489
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Jing Zhao
>            Assignee: Robert Kanter
>         Attachments: HADOOP-10489.patch
>
>
> Currently UserGroupInformation#getTokens and UserGroupInformation#addToken uses UGI's
monitor to protect the iteration and modification of Credentials#tokenMap. Per [discussion|https://issues.apache.org/jira/browse/HADOOP-10475?focusedCommentId=13965851&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13965851]
in HADOOP-10475, this can still lead to ConcurrentModificationException.



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