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Date: Mon, 23 Mar 2009 12:07:50 -0700 (PDT)
From: "Konstantin Shvachko (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5551) Namenode permits directory
 destruction on overwrite
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    [ https://issues.apache.org/jira/browse/HADOOP-5551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12688383#action_12688383 ] 

Konstantin Shvachko commented on HADOOP-5551:
---------------------------------------------

Looks like your solution will work only if permission is enabled. If not it will still replace the directory by the file.
Could you please include a test for that. You can just add a test case to TestFileCreation in order to avoid cluster startup / shutdown just for this one operation.

> Namenode permits directory destruction on overwrite
> ---------------------------------------------------
>
>                 Key: HADOOP-5551
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5551
>             Project: Hadoop Core
>          Issue Type: Bug
>    Affects Versions: 0.19.1
>            Reporter: Brian Bockelman
>            Priority: Critical
>         Attachments: HADOOP-5551.patch
>
>
> The FSNamesystem's startFileInternal allows overwriting of directories.  That is, if you have a directory named /foo/bar and you try to write a file named /foo/bar, the file is written and the directory disappears.
> This is most apparent for folks using libhdfs directly, as overwriting is always turned on.  Therefore, if libhdfs applications do not check the existence of a directory first, then they will permit new files to destroy directories.

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