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https://issues.apache.org/jira/browse/HADOOP-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12795674#action_12795674
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Doug Cutting commented on HADOOP-6427:
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I think this is getting too hairy.  Let's just use URI#resolve(src, dest).  If 
dest is hdfs:///foo, then resolve returns hdfs:///foo and attempts to 
dereference the link will fail.  We don't implement an authority-defaulting 
mechanism when a scheme is provided.  Note that one could link to //host/foo, 
and if accessed over hftp this would resolve one way, and if over hdfs another.

Sorry for introducing the idea of this feature.


> Add Path isQualified
> --------------------
>
>                 Key: HADOOP-6427
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6427
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-6427-1.patch
>
>
> The Path class has a method to make a path qualified but not to query if the 
> path is qualified. This is needed for HADOOP-64221. In addition this patch 
> adds tests to TestPath that cover the file scheme. Note that "fully 
> qualified" applies to domain names not URIs so this function and it tests 
> also serve to define what we mean by a fully qualified path.

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