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Posted to common-dev@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2013/03/26 15:21:17 UTC

[jira] [Created] (HADOOP-9436) NetgroupCache does not refresh membership correctly

Kihwal Lee created HADOOP-9436:
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             Summary: 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


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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