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Posted to common-issues@hadoop.apache.org by "Jing Zhao (JIRA)" <ji...@apache.org> on 2014/04/09 00:49:15 UTC

[jira] [Commented] (HADOOP-10475) ConcurrentModificationException in AbstractDelegationTokenSelector.selectToken()

    [ https://issues.apache.org/jira/browse/HADOOP-10475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13963563#comment-13963563 ] 

Jing Zhao commented on HADOOP-10475:
------------------------------------

Looks like the issue is that AbstractDelegationTokenSelector#selectToken tries to iterate the tokensMap, while another thread tries to add a new token to the UGI. The monitor of UGI cannot prevent this race, since the UserGroupInformation#getTokens returns the whole token map. 

> ConcurrentModificationException in AbstractDelegationTokenSelector.selectToken()
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-10475
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10475
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.4.0
>            Reporter: Arpit Gupta
>            Assignee: Jing Zhao
>
> While running a hive job on a HA cluster saw ConcurrentModificationException in AbstractDelegationTokenSelector.selectToken()



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