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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8174) Remove confusing comment in Path#isAbsolute()
Date Thu, 15 Mar 2012 19:58:37 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230481#comment-13230481

Eli Collins commented on HADOOP-8174:

The confusion is because there are two separate perspectives:

# Whether a *path* is absolute (ie the reference is non-relative, starts with the root). Ie
/foo is an absolute path.
# Whether a *URI* is absolute (ie [URI#isAbsolute|http://docs.oracle.com/javase/6/docs/api/java/net/URI.html#isAbsolute()]
where "A URI is absolute if, and only if, it has a scheme component"). Ie "/foo" is not absolute
URI, but file:///foo is.

Because Hadoop Paths are represented by, and are just thin wrappers around, URIs (which is
goofy!) there is some ambiguity. 

Given that the intent of Path#isAbsolute is #1 (the class-level javadoc states "A path string
is absolute if it begins with a slash.") I think we should update the Path#isAbsolute javadoc
to indicate this. It's also worth putting the above discussion in a class-level comment since
it's not clear that we intend Path to be a file system path in most cases.
> Remove confusing comment in Path#isAbsolute()
> ---------------------------------------------
>                 Key: HADOOP-8174
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8174
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 0.23.0
>            Reporter: Suresh Srinivas
>            Assignee: Sanjay Radia
>             Fix For: 0.24.0
> The method is checking for absolute path correctly. When scheme and authority are present,
the path is absolute. So the following comment needs to be removed.
> {noformat}
>   /**
>    * There is some ambiguity here. An absolute path is a slash
>    * relative name without a scheme or an authority.
>    * So either this method was incorrectly named or its
>    * implementation is incorrect. This method returns true
>    * even if there is a scheme and authority.
>    */
> {noformat}

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