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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6818) Provide a JNI-based implementation of GroupMappingServiceProvider
Date Thu, 09 Sep 2010 05:53:34 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907527#action_12907527

Todd Lipcon commented on HADOOP-6818:

Took a look at this patch today, a few notes:
- In the static initializer of JniBasedUnixGroupsMapping instead of logging Info and throwing
an empty RTE, would be nice to include that message as the message of the RTE.
- In the C code, rather than having a separate function to free things, maybe just use a goto
to the end of the function? The forward declaration is a little odd, stylistically.
- Would be good to add a comment explaining how to run the "test" in getGroup.c, as well 
- in getGroupDetails, probably safer to check if sysconf returns a positive number, and if
not set it to something reasonable like 512. Should also probably add sizeof(struct group)
to the buffer size here.

Otherwise looks good. Also +1 on the simplification of the automake structure.

> Provide a JNI-based implementation of GroupMappingServiceProvider
> -----------------------------------------------------------------
>                 Key: HADOOP-6818
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6818
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>            Reporter: Devaraj Das
>            Assignee: Devaraj Das
>             Fix For: 0.22.0
>         Attachments: hadoop-6818-1.patch, hadoop-6818-2.patch, JNIGroupMapping.patch
> The default implementation of GroupMappingServiceProvider does a fork of a unix command
to get the groups of a user. Since the group resolution happens in the servers, this might
be costly. This jira aims at providing a JNI-based implementation for GroupMappingServiceProvider.

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