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From "Kazuho Fujii (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12543) Path#isRoot() returns true if the path is ".".
Date Wed, 04 Nov 2015 01:13:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14988648#comment-14988648
] 

Kazuho Fujii commented on HADOOP-12543:
---------------------------------------

Hi, thanks for the comment.

{{new Path(new Path("/tmp"), new Path(".."))}} equals {{new Path("/")}}. {{new Path("/").isRoot()}}
equals true. This is OK.

The behavior for relative path is misreading. {{new Path("..").getParent()}} equals {{new
Path(".")}}.  {{new Path(".").isRoot()}} always return true in the current implementation.

A Path class object doesn't know the working directory. It can not say whether it repesents
the root directory for relative path.

Just seeing the method name and the comment, I misunderstood it returns true iif the path
is "/". 

> Path#isRoot() returns true if the path is ".".
> ----------------------------------------------
>
>                 Key: HADOOP-12543
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12543
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>            Reporter: Kazuho Fujii
>         Attachments: HADOOP-12543.001.patch
>
>
> {{Path#isRoot()}} method is expected to return true if and only if the path represents
the root of a file system. But, it returns true in the case where the path is ".". This is
because {{getParent()}} method returns null when the path in URI is empty.



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