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https://issues.apache.org/jira/browse/HADOOP-10650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14094956#comment-14094956
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Arpit Agarwal commented on HADOOP-10650:
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Could you please add a comment to {{protocolToAcls}} stating that the the first
ACL in the array is allow and the second one is deny.
+1 with this change, the patch looks good otherwise.
> Add ability to specify a reverse ACL (black list) of users and groups
> ---------------------------------------------------------------------
>
> Key: HADOOP-10650
> URL: https://issues.apache.org/jira/browse/HADOOP-10650
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: security
> Reporter: Benoy Antony
> Assignee: Benoy Antony
> Attachments: HADOOP-10650.patch, HADOOP-10650.patch
>
>
> Currently , it is possible to define a ACL (user and groups) for a service.
> To temporarily remove authorization for a set of users, administrator needs
> to remove the users from the specific group and this may be a lengthy process
> ( update ldap groups, flush caches on machines).
> If there is a facility to define a reverse ACL for services, then
> administrator can disable users by specifying the users in reverse ACL. In
> other words, one can specify a whitelist of users and groups as well as a
> blacklist of users and groups.
> One can also specify a default blacklist to disable the users from accessing
> any service.
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