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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5117) Allow the owner of an HDFS path to be a group
Date Wed, 21 Aug 2013 20:45:54 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13746825#comment-13746825
] 

Colin Patrick McCabe commented on HDFS-5117:
--------------------------------------------

Files already have a group associated with them.  Use {{hadoop fs -ls}} to find out what that
group is.  Use {{hadoop fs -chgrp}} to change the group.

If a file's mode is set to 775, everyone in the same group as the file will be able to write
to it.  Files can be deleted or added to a directory if one has write access to the parent
directory.

So in summary, I think this should be closed as invalid.
                
> Allow the owner of an HDFS path to be a group
> ---------------------------------------------
>
>                 Key: HDFS-5117
>                 URL: https://issues.apache.org/jira/browse/HDFS-5117
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: hdfs-client
>            Reporter: Ryan Hennig
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> At eBay, we have the need to associate some HDFS paths with a set of users with write
access, a set of users with read-only access, and neither read or write to others.
> The current model of POSIX-style permissions is nearly sufficient for this, except for
the need of multiple writers.
> One easy fix would be to allow the owner of a path to be a group, and then grant owner
permissions to all members of that group.  I have verified that HDP 1.3 allows you to set
the owner of a path to a group without error, but the owner permissions of that group are
not given to members of the group.
> I've created a relatively simple fix for this by modifying the "check" method in src/hdfs/org/apache/hadoop/hdfs/server/namenode/FSPermissionChecker.java
and I am working on related changes to unit tests etc now.
> - Ryan

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