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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13343) globStatus returns null for file path that exists but is filtered
Date Mon, 11 Jul 2016 22:22:11 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15371778#comment-15371778
] 

Jason Lowe commented on HADOOP-13343:
-------------------------------------

Thanks for chiming in, [~stevel@apache.org] and [~cmccabe].  I filed it without knowing for
sure what the "right" fix is.  As Colin points out, it may be dangerous to change this behavior
since it's been this way for so long.  Someone may have intentionally or accidentally relied
on the behavior.  So I could see this as simply updating the javadoc to explain how globbing
and filtering interact without any semantic changes at all.  Or we decide to fix the semantics
but only in 3.x, etc.

My personal preference would be to have it act consistent with globbing patterns failing to
match when the base path does exist.  And I'm totally fine if we decide this is best done
on a major-release boundary to minimize the surprises for users when upgrading.

> globStatus returns null for file path that exists but is filtered
> -----------------------------------------------------------------
>
>                 Key: HADOOP-13343
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13343
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 2.7.2
>            Reporter: Jason Lowe
>            Priority: Minor
>         Attachments: HADOOP-13343.001.patch
>
>
> If a file path without globs is passed to globStatus and the file exists but the specified
input filter suppresses it then globStatus will return null instead of an empty array.  This
makes it impossible for the caller to discern the difference between the file not existing
at all vs. being suppressed by the filter and is inconsistent with the way it handles globs
for an existing dir but fail to match anything within the dir.



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