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https://issues.apache.org/jira/browse/HADOOP-9436?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee updated HADOOP-9436:
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Status: Patch Available (was: Open)
> 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: 2.0.3-alpha, 3.0.0, 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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