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https://issues.apache.org/jira/browse/HADOOP-13590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15506881#comment-15506881
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Steve Loughran commented on HADOOP-13590:
-----------------------------------------

LGTM, though other Kerberos people need to look at the code too...this is so 
sensitive we almost need multiple votes on it.

Can you add an accessor to stop that checkstyle warning?

> Retry until TGT expires even if the UGI renewal thread encountered exception
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-13590
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13590
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>    Affects Versions: 2.8.0, 2.7.3, 2.6.4
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>         Attachments: HADOOP-13590.01.patch, HADOOP-13590.02.patch, 
> HADOOP-13590.03.patch
>
>
> The UGI has a background thread to renew the tgt. On exception, it 
> [terminates 
> itself|https://github.com/apache/hadoop/blob/bee9f57f5ca9f037ade932c6fd01b0dad47a1296/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java#L1013-L1014]
> If something temporarily goes wrong that results in an IOE, even if it 
> recovered no renewal will be done and client will eventually fail to 
> authenticate. We should retry with our best effort, until tgt expires, in the 
> hope that the error recovers before that.



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