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https://issues.apache.org/jira/browse/HADOOP-10475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13963575#comment-13963575
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Jing Zhao commented on HADOOP-10475:
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Currently we directly get the whole token map through
UserGroupInformation#getTokens, and pass it around for works like token
selection. Instead of doing this, we may want to provide a different API in UGI
class which takes token selector as parameter and process the token selection.
Another quick and simple fix is to use a ConcurrentMap for Credentials#tokenMap.
> 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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