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https://issues.apache.org/jira/browse/HADOOP-10475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13963622#comment-13963622
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Haohui Mai commented on HADOOP-10475:
-------------------------------------
Let's put a comment there to show why {{ConcurrentHashMap}} is used. +1 after
address it.
> 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
>
>
> While running a hive job on a HA cluster saw ConcurrentModificationException
> in AbstractDelegationTokenSelector.selectToken()
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