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From "Matt Foley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7327) FileSystem.listStatus() throws NullPointerException instead of IOException upon access permission failure
Date Thu, 02 Jun 2011 01:50:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13042568#comment-13042568
] 

Matt Foley commented on HADOOP-7327:
------------------------------------

Daryn, at the point of this patch insertion, all we know is that the underlying call (via
the abstract API) returned null.  How do you propose to distinguish among the possible causes?

> FileSystem.listStatus() throws NullPointerException instead of IOException upon access
permission failure
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-7327
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7327
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.22.0, 0.23.0
>            Reporter: Matt Foley
>            Assignee: Matt Foley
>         Attachments: hadoop-7327-1.patch
>
>
> Many processes that call listStatus() expect to handle IOException, but instead are getting
runtime error NullPointerException, if the directory being scanned is visible but no-access
to the running user id.  For example, if directory foo is drwxr-xr-x, and subdirectory foo/bar
is drwx------, then trying to do listStatus(Path(foo/bar)) will cause a NullPointerException.

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