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https://issues.apache.org/jira/browse/HDFS-8983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15395557#comment-15395557
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Steve Loughran commented on HDFS-8983:
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...just came across this.
Currently we say in filesystem.md that HDFS is a special case, in which
{{delete("/",true)}} always fails. Does this patch change the root directory
behaviour? that is, {{ {{delete("/",true) -. AccessControlException}} ?
> NameNode support for protected directories
> ------------------------------------------
>
> Key: HDFS-8983
> URL: https://issues.apache.org/jira/browse/HDFS-8983
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.7.1
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Fix For: 2.8.0
>
> Attachments: HDFS-8393.01.patch, HDFS-8393.02.patch,
> HDFS-8983.03.patch, HDFS-8983.04.patch
>
>
> To protect important system directories from inadvertent deletion (e.g.
> /Users) the NameNode can allow marking directories as _protected_. Such
> directories cannot be deleted unless they are empty.
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