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https://issues.apache.org/jira/browse/HDFS-7568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14270305#comment-14270305
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Yi Liu commented on HDFS-7568:
------------------------------
{quote}
Looks like the first type of immutability is similar to setting read-only
r--r--r-- permission on a directory recursively? If I didn't miss anything.
{quote}
Not exactly. For example, the {{delete}} only requires the "w" permission of
parent path, so in this case, the file/directory still can be removed.
Furthermore, the fs permission can't protect operation from hdfs super user.
> 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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