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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