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https://issues.apache.org/jira/browse/HADOOP-8409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13287428#comment-13287428
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Suresh Srinivas commented on HADOOP-8409:
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bq. In line with this, I spent quite a bit of time thinking about pros and cons 
to having Path object support backslash VS not. Both approaches have legitimate 
pros and cons. Once I sum them up on my end, I'll reply back.

@Please also look at the issues raised in HADOOP-8139 and the reasons why we 
did not support windows paths on HDFS. 
                
> Address Hadoop path related issues on Windows
> ---------------------------------------------
>
>                 Key: HADOOP-8409
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8409
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs, test, util
>    Affects Versions: 1.0.0
>            Reporter: Ivan Mitic
>            Assignee: Ivan Mitic
>         Attachments: HADOOP-8409-branch-1-win.patch
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> There are multiple places in prod and test code where Windows paths are not 
> handled properly. From a high level this could be summarized with:
> 1. Windows paths are not necessarily valid DFS paths (while Unix paths are)
> 2. Windows paths are not necessarily valid URIs (while Unix paths are)
> #1 causes a number of tests to fail because they implicitly assume that local 
> paths are valid DFS paths (by extracting the DFS test path from for example 
> "test.build.data" property)
> #2 causes issues when URIs are directly created on path strings passed in by 
> the user

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