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Date: Sun, 22 Mar 2009 09:49:50 -0700 (PDT)
From: "Brian Bockelman (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (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:all-tabpanel ]

Brian Bockelman updated HADOOP-5551:
------------------------------------

    Attachment: HADOOP-5551.patch

Suggested patch attached.

> 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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