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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8709) globStatus changed behavior from 0.20/1.x
Date Fri, 17 Aug 2012 22:02:38 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13437104#comment-13437104

Daryn Sharp commented on HADOOP-8709:

bq. [...] it does provide the ability to distinguish between a non-existent expected directory
level vs. a pattern matching nothing for some cases. I can see some merit there.

The big demerit is now it's impossible to distinguish "not a glob, doesn't exist" and "is
a glob, but a parent dir doesn't exist" because FNF means either.  Let's say I want to create
a path that doesn't exist iff it's not a glob.  How do I do that?  I don't want to accidentally
create a path with glob metachars in it...

I think FNF should only be thrown for non-existent non-glob paths.  That alone is an incompatible
change that requires a try block.  Throwing FNF for any glob path breaks the semantics of
the method and there is no workaround.
> globStatus changed behavior from 0.20/1.x
> -----------------------------------------
>                 Key: HADOOP-8709
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8709
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.23.0, 2.0.0-alpha
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: HADOOP-8709.patch
> In 0.20 or 1.x, globStatus will return an empty array if the glob pattern does not match
any files.  After HADOOP-6201 it throws FileNotFoundException.  The javadoc states it will
return an empty array.

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