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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4771) Remove the assumption that symlink is inside HDFS namespace and resolvable
Date Thu, 02 May 2013 12:46:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13647478#comment-13647478
] 

Daryn Sharp commented on HDFS-4771:
-----------------------------------

I had tested this on OS X so honoring permissions for link resolution is probably BSD behavior.
 I'll take the discussion to HDFS-948.
                
> Remove the assumption that symlink is inside HDFS namespace and resolvable
> --------------------------------------------------------------------------
>
>                 Key: HDFS-4771
>                 URL: https://issues.apache.org/jira/browse/HDFS-4771
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 3.0.0
>            Reporter: Brandon Li
>
> Currently HDFS always resolves symlink when setting certain file attributes, such as
setPermission and setTime. And thus the client can't set some file attributes of the symlink
itself.
> Two major problems with current symlink support:
>  1. HDFS assumes the link is inside its own namespace. This is a problem when HDFS is
integrated into client's file system namespace.
> 2. Suppose the linked target is inside HFDS, HDFS doesn't really check whether the target
saved in the link file is a valid path. Even the target was valid, it could become invalid
as the namespace changes.
> For example, create a symlink /user/brandon/iamlink.lnk and it has the content(target)
as "/invalid/path". The file /user/brandon/iamlink.lnk can't be deleted since HDFS can't resolve
it.

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