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https://issues.apache.org/jira/browse/HDFS-12372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16147594#comment-16147594
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Kihwal Lee commented on HDFS-12372:
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You should not run datanode as a hdfs superuser. Many examples show "dn" as a
datanode user, which is not a privileged user. Some people also use
"hadoop.security.auth_to_local" to map the dn user to the hdfs superuser. This
is also not a good practice. One compromised datanode allows a superuser
access to the hdfs cluster.
> Document the impact of HDFS-11069 (Tighten the authorization of datanode RPC)
> -----------------------------------------------------------------------------
>
> Key: HDFS-12372
> URL: https://issues.apache.org/jira/browse/HDFS-12372
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.8.0, 2.9.0, 2.7.4, 3.0.0-alpha2
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
>
> The idea of HDFS-11069 is good. But it seems to cause confusion for
> administrators when they issue commands like hdfs diskbalancer, or hdfs
> dfsadmin, because this change of behavior is not documented properly.
> I suggest we document a recommended way to kinit (e.g. kinit as
> hdfs/ho...@host1.example.com, rather than h...@example.com), as well as
> documenting a notice for running privileged DataNode commands in a Kerberized
> clusters
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