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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9415) Document dfs.cluster.administrators and dfs.permissions.superusergroup
Date Tue, 22 Dec 2015 20:27:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15068678#comment-15068678
] 

Arpit Agarwal commented on HDFS-9415:
-------------------------------------

Thanks [~xiaobingo]. We should document the format of this setting with examples. {{AccessControlList.java}}
has a good description that we can reuse.

{code}
   * The String is a a comma separated list of users and groups.
   * The user list comes first and is separated by a space followed 
   * by the group list. For e.g. "user1,user2 group1,group2"
{code}

We can add that both users and groups are optional. So "user1", " group1", "", "user1 group1",
"user1,user2 group1,group2" are all valid (note the leading space in " group1").

Also for {{dfs.permissions.supergroup}}, we should document that it accepts a single group
name as the value. I have seen some administrators try to incorrectly configure this as a
comma separated list of groups.

> Document dfs.cluster.administrators and dfs.permissions.superusergroup
> ----------------------------------------------------------------------
>
>                 Key: HDFS-9415
>                 URL: https://issues.apache.org/jira/browse/HDFS-9415
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Arpit Agarwal
>            Assignee: Xiaobing Zhou
>         Attachments: HDFS-9415.001.patch
>
>
> dfs.cluster.administrators and dfs.permissions.superusergroup documentation is not clear
enough.



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