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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9436) NetgroupCache does not refresh membership correctly
Date Fri, 29 Mar 2013 16:57:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13617505#comment-13617505
] 

Kihwal Lee commented on HADOOP-9436:
------------------------------------

Silly me, I didn't svn add the new test.
                
> NetgroupCache does not refresh membership correctly
> ---------------------------------------------------
>
>                 Key: HADOOP-9436
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9436
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 3.0.0, 2.0.3-alpha, 0.23.7
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>         Attachments: HADOOP-9436.patch
>
>
> NetgroupCache is used to get around the problem of inability to obtain a single user-to-groups
mapping from netgroup. For example, the ACL code pre-populates this cache, so that any user-group
mapping can be resolved for all groups defined in the service.
> However, the current refresh code only adds users to existing groups, so a loss of group
membership won't take effect. This is because the internal user-groups mapping cache is never
invalidated. If this is simply invalidated on clear(), the cache entries will build up correctly,
but user-group resolution may fail during refresh, resulting in incorrectly denying accesses.

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