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https://issues.apache.org/jira/browse/HADOOP-9232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13583959#comment-13583959
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Chris Nauroth commented on HADOOP-9232:
---------------------------------------
{quote}
We should try to make Java side interfaces platform independent (where we can)
and only have platform dependent implementations.
{quote}
Agreed with this. The established pattern is to code platform-agnostic
interfaces on the Java side and build platform-specific implementations of the
JNI functions using conditional compilation. Introducing a
JniBasedWinGroupsMapping.java would be a divergence from this pattern.
> 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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