[jira] [Created] (HADOOP-10851) NetgroupCache does not remove group memberships

["Benoy Antony (JIRA)" <ji...@apache.org>]

Benoy Antony created HADOOP-10851:
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             Summary: NetgroupCache does not remove group memberships
                 Key: HADOOP-10851
                 URL: https://issues.apache.org/jira/browse/HADOOP-10851
             Project: Hadoop Common
          Issue Type: Bug
          Components: security
    Affects Versions: 2.4.1
            Reporter: Benoy Antony
            Assignee: Benoy Antony


_NetgroupCache_ is used by _GroupMappingServiceProvider_ implementations based on net groups.
But it has a serious flaw in that once a user to group membership is established, it remains forever even if user is actually removed from the netgroup and cache is cleared.  It is cleared only if the server is restarted.

To reproduce this: 

* Cache a group with a set of users.
* Test membership correctness.
* Clear cache, remove a user from the group and cache the group again
* Expected result : user’s groups should not include the group from which he/she is removed. 
* Actual result : user’s groups includes the group from which he/she was removed.

It is also noted that _NetgroupCache_ has concurrency issues and a separate jira is filed to rectify them.




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