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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 Sat, 17 May 2014 01:17:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14000585#comment-14000585
] 

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

The patch looks good to me. +1 pending Jenkins (which I've just kicked.)

> 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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