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From "Charles Lamb (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6375) Listing extended attributes with the search permission
Date Fri, 16 May 2014 20:35:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14000266#comment-14000266

Charles Lamb commented on HDFS-6375:

[~andrew.wang] and I had an offline discussion. He is concerned that permissions fallback
does not provide any distinction between true null values (i.e. no value was set for the xattr
when it was created) and "you don't have permission" null values. He proposes that we add
a new xattr method in the api which will allow for scanning values, similar to http://linux.die.net/man/2/listxattr.
If there are xattrs with null values then it will return those as long as the caller had access.
If you only have scan access then the method would not even return the name.

[~cnauroth], [~hitliuyi], what are your thoughts?

> Listing extended attributes with the search permission
> ------------------------------------------------------
>                 Key: HDFS-6375
>                 URL: https://issues.apache.org/jira/browse/HDFS-6375
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>    Affects Versions: HDFS XAttrs (HDFS-2006)
>            Reporter: Andrew Wang
>            Assignee: Charles Lamb
>         Attachments: HDFS-6375.1.patch, HDFS-6375.2.patch, HDFS-6375.3.patch, HDFS-6375.4.patch
> From the attr(5) manpage:
> {noformat}
>        Users with search access to a file or directory may retrieve a list  of
>        attribute names defined for that file or directory.
> {noformat}
> This is like doing {{getfattr}} without the {{-d}} flag, which we currently don't support.

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