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https://issues.apache.org/jira/browse/HADOOP-14987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16424445#comment-16424445
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Xiao Chen commented on HADOOP-14987:
------------------------------------

The conflicts were trivial so I resolved it on the fly. Can you get the diff 
from git history?

> Improve KMSClientProvider log around delegation token checking
> --------------------------------------------------------------
>
>                 Key: HADOOP-14987
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14987
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 2.7.3
>            Reporter: Xiaoyu Yao
>            Assignee: Xiaoyu Yao
>            Priority: Major
>             Fix For: 3.0.0, 2.10.0, 2.8.4, 2.9.2
>
>         Attachments: HADOOP-14987.001.patch, HADOOP-14987.002.patch, 
> HADOOP-14987.003.patch, HADOOP-14987.004.patch, HADOOP-14987.005.patch
>
>
> KMSClientProvider#containsKmsDt uses SecurityUtil.buildTokenService(addr) to 
> build the key to look for KMS-DT from the UGI's token map. The token lookup 
> key here varies depending  on the KMSClientProvider's configuration value for 
> hadoop.security.token.service.use_ip. In certain cases, the token obtained 
> with non-matching hadoop.security.token.service.use_ip setting will not be 
> recognized by KMSClientProvider. This ticket is opened to improve logs for 
> troubleshooting KMS delegation token related issues like this.  



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