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https://issues.apache.org/jira/browse/HADOOP-4656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12663381#action_12663381
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Allen Wittenauer commented on HADOOP-4656:
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Privately, someone asked about caching the group content.
One of the big advantages of talking to the OS is that many systems include a
naming services caching daemon that handles caching group and similar content
for the entire machine. nscd generally includes great support for controlling
the size, ttl, negative ttl, etc, for the cache. Duplicating that
functionality seems like overkill and, worse, will act as a cache against a
cache!
> Add a user to groups mapping service
> -------------------------------------
>
> Key: HADOOP-4656
> URL: https://issues.apache.org/jira/browse/HADOOP-4656
> Project: Hadoop Core
> Issue Type: Improvement
> Components: security
> Affects Versions: 0.19.0
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Attachments: HADOOP-4656_0_20090108.patch
>
>
> Currently the IPC client sends the UGI which contains the user/group
> information for the Server. However this represents the groups for the user
> on the client-end. The more pertinent mapping from user to groups is actually
> the one seen by the Server. Hence the client should only send the user and we
> should add a 'group mapping service' so that the Server can query it for the
> mapping.
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