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https://issues.apache.org/jira/browse/HADOOP-10475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13963746#comment-13963746
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Jing Zhao commented on HADOOP-10475:
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Tests failed because ConcurrentHashMap does not support null key. I'm not sure
why we want to allow null key for token map. I will post a patch which simply
reverts the corresponding change from HADOOP-8726.
> 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
> Attachments: HADOOP-10475.000.patch, HADOOP-10475.001.patch
>
>
> While running a hive job on a HA cluster saw ConcurrentModificationException
> in AbstractDelegationTokenSelector.selectToken()
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