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https://issues.apache.org/jira/browse/HDFS-12907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16282451#comment-16282451
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Daryn Sharp commented on HDFS-12907:
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bq. It's so they don't accidentally write data without xattrs or with the wrong
xattrs, which would be essentially corrupt.
This morning, Rushabh and I discussed/debated non-superuser write access, and
my position too is non-superusers should not have access to raw attrs like
feinfo. I see no use case except allowing users to (un)intentionally lose
access to their data. Except...
I am inclined to believe that create should have been extended to allow an
optional feinfo. NN verifies the key name is correct, output stream doesn't
encrypt. Or creating a raw path requires a mandatory feinfo. Lots of messy
backwards compat issues to consider which is why it's a topic for another jira.
> Allow read-only access to reserved raw for non-superusers
> ---------------------------------------------------------
>
> Key: HDFS-12907
> URL: https://issues.apache.org/jira/browse/HDFS-12907
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.6.0
> Reporter: Daryn Sharp
> Assignee: Rushabh S Shah
> Attachments: HDFS-12907.patch
>
>
> HDFS-6509 added a special /.reserved/raw path prefix to access the raw file
> contents of EZ files. In the simplest sense it doesn't return the FE info in
> the {{LocatedBlocks}} so the dfs client doesn't try to decrypt the data.
> This facilitates allowing tools like distcp to copy raw bytes.
> Access to the raw hierarchy is restricted to superusers. This seems like an
> overly broad restriction designed to prevent non-admins from munging the EZ
> related xattrs. I believe we should relax the restriction to allow
> non-admins to perform read-only operations. Allowing non-superusers to
> easily read the raw bytes will be extremely useful for regular users, esp.
> for enabling webhdfs client-side encryption.
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