Jing Zhao created HADOOP-10489:
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Summary: 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
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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