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From "Chuan Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9232) JniBasedUnixGroupsMappingWithFallback fails on Windows with UnsatisfiedLinkError
Date Mon, 18 Feb 2013 23:37:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13580895#comment-13580895
] 

Chuan Liu commented on HADOOP-9232:
-----------------------------------

The code looks very good!
However, the "JniBasedUnixGroupsMappingWin" name seems a weird for me.
I think a better approach may be to create a seperate JniBasedWinGroupsMapping.java class
and add some Java code to use choose JniBasedWinGroupsMapping and JniBasedUnixGroupsMapping
based on the platform. This way we can also seperate the native implementation more easily
in the future.
                
> JniBasedUnixGroupsMappingWithFallback fails on Windows with UnsatisfiedLinkError
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-9232
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9232
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: native, security
>    Affects Versions: trunk-win
>            Reporter: Chris Nauroth
>            Assignee: Ivan Mitic
>         Attachments: HADOOP-9232.branch-trunk-win.jnigroups.2.patch, HADOOP-9232.branch-trunk-win.jnigroups.3.patch,
HADOOP-9232.branch-trunk-win.jnigroups.patch
>
>
> {{JniBasedUnixGroupsMapping}} calls native code which isn't implemented properly for
Windows, causing {{UnsatisfiedLinkError}}.  The fallback logic in {{JniBasedUnixGroupsMappingWithFallback}}
works by checking if the native code is loaded during startup.  In this case, hadoop.dll is
present and loaded, but it doesn't contain the right code.  There will be no attempt to fallback
to {{ShellBasedUnixGroupsMapping}}.

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