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https://issues.apache.org/jira/browse/HADOOP-12897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15234412#comment-15234412
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Yuanbo Liu commented on HADOOP-12897:
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How about logging the URL when debug level is enabled
> KerberosAuthenticator.authenticate to include URL on IO failures
> ----------------------------------------------------------------
>
> Key: HADOOP-12897
> URL: https://issues.apache.org/jira/browse/HADOOP-12897
> Project: Hadoop Common
> Issue Type: Improvement
> Components: security
> Affects Versions: 2.8.0
> Reporter: Steve Loughran
> Priority: Minor
>
> If {{KerberosAuthenticator.authenticate}} can't connect to the endpoint, you
> get a stack trace, but without the URL it is trying to talk to.
> That is: it doesn't have any equivalent of the {{NetUtils.wrapException}}
> handler —which can't be called here as its not in the {{hadoop-auth}} module
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