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https://issues.apache.org/jira/browse/HADOOP-13590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15511820#comment-15511820
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Kai Zheng commented on HADOOP-13590:
------------------------------------

Thanks [~xiaochen] for the quick action!

bq. Good news is we can remove the shouldSkipSleepForTests param, making the 
test more real.
Ah, right! This is exactly what I wanted to say and wish to happen. As we all 
know, UGI codes pretty hard to maintain, would love to see some day all the 
test related codes separated out and cleaned up ...

I will look at it closely late today.

> 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, HADOOP-13590.04.patch, HADOOP-13590.05.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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