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https://issues.apache.org/jira/browse/HDFS-7546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14590264#comment-14590264
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Allen Wittenauer commented on HDFS-7546:
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I committed this to trunk only because my time is more valuable than branch-2.
> Document, and set an accepting default for
> dfs.namenode.kerberos.principal.pattern
> ----------------------------------------------------------------------------------
>
> Key: HDFS-7546
> URL: https://issues.apache.org/jira/browse/HDFS-7546
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: security
> Affects Versions: 2.1.1-beta
> Reporter: Harsh J
> Assignee: Harsh J
> Priority: Minor
> Labels: supportability
> Fix For: 3.0.0
>
> Attachments: HDFS-7546.patch
>
>
> This config is used in the SaslRpcClient, and the no-default breaks
> cross-realm trust principals being used at clients.
> Current location:
> https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslRpcClient.java#L309
> The config should be documented and the default should be set to * to
> preserve the prior-to-introduction behaviour.
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