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https://issues.apache.org/jira/browse/HADOOP-8957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13528568#comment-13528568
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Sanjay Radia commented on HADOOP-8957:
--------------------------------------

RawLocalFs#isValidName returning true is incorrect.
It uses DelegatesToFileSystem to delegate to RawLocalFileSystem which does not 
implement isValidName. This is Tricky.
Proposal:
* RawLocalFs#isValidName does a isWindows check otherwise calls 
super#isValidName.
                
> AbstractFileSystem#IsValidName should be overridden for embedded file systems 
> like ViewFs
> -----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8957
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8957
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: trunk-win
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>         Attachments: HADOOP-8957-branch-trunk-win.2.patch, HADOOP-8957.patch, 
> HADOOP-8957.patch
>
>
> This appears to be a problem with parsing a Windows-specific path, ultimately 
> throwing InvocationTargetException from AbstractFileSystem.newInstance.

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