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