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https://issues.apache.org/jira/browse/HDFS-7568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14283316#comment-14283316
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Tsz Wo Nicholas Sze commented on HDFS-7568:
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> Administrator or owner of the directory can change immutability of directory
> to off to make it a regular directory.
If immutability can be turned off, is it still satisfied the regulatory
compliance requirement?
> Looks like the first type of immutability is similar to setting read-only
> {{r-\-r-\-r--}} permission on a directory recursively? ...
I guess you probably mean r-xr-xr-x. Otherwise, file read is not allowed. For
r-xr-xr-x directories, append to a file is allowed.
> Support immutability (Write-once-read-many) in HDFS
> ---------------------------------------------------
>
> Key: HDFS-7568
> URL: https://issues.apache.org/jira/browse/HDFS-7568
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: namenode
> Affects Versions: 2.7.0
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
>
> Many regulatory compliance requires storage to support WORM functionality to
> protect sensitive data from being modified or deleted. This jira proposes
> adding that feature to HDFS.
> See the following comment for more description.
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