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https://issues.apache.org/jira/browse/HADOOP-9791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13725091#comment-13725091
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Steve Loughran commented on HADOOP-9791:
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That's MAX_PATH for non-UNICODED paths in NTFS; paths that don't begin {{\\?\}}

see 
[http://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx#maxpath]
                
> Add a test case covering long paths for new FileUtil access check methods
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-9791
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9791
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 3.0.0, 1-win, 2.1.0-beta
>            Reporter: Ivan Mitic
>            Assignee: Ivan Mitic
>         Attachments: HADOOP-9791.branch-1-win.patch
>
>
> We've seen historically that paths longer than 260 chars can cause things not 
> to work on Windows if not properly handled. Filing a tracking Jira to add a 
> native io test case with long paths for new FileUtil access check methods 
> added with HADOOP-9413. 

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