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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12907) Allow read-only access to reserved raw for non-superusers
Date Fri, 08 Dec 2017 17:13:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16283859#comment-16283859
] 

Xiao Chen commented on HDFS-12907:
----------------------------------

bq. KSMCP
FWIW I also dreamt the KMS uses Hadoop RPC instead of restful APIs over tomcat, when I was
dealing with KMSCP auth issues and perf issues. Though that has its own pros and cons for
sure...

At least fixes like HADOOP-12787 should work after your webhdfs jiras.

FWIW, I think the initial KMSCP design _was_ to make it to be when they were created. But
it didn't work for some cases with the stir of client cache, proxy and token. HADOOP-13749
is where this was changed. 

> 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-12907.001.patch, 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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