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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-245) Create symbolic links in HDFS
Date Fri, 25 Sep 2009 17:02:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12759624#action_12759624
] 

Allen Wittenauer commented on HDFS-245:
---------------------------------------

The reason for chown -h and friends is simple:  what happens when a link needs to move or
be controlled by a different entity than the same one as the directory? Think access control!
 If I want to force a user to use a different server for data (esp RO), having the link owned
by them defeats the purpose. I don't have enough fingers or toes to count the number of times
I've had to use this under UNIX. (or, at least, UNIXes that conformed with IEEE Std 1003.1...
)

> Create symbolic links in HDFS
> -----------------------------
>
>                 Key: HDFS-245
>                 URL: https://issues.apache.org/jira/browse/HDFS-245
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: 4044_20081030spi.java, designdocv1.txt, HADOOP-4044-strawman.patch,
symlink-0.20.0.patch, symLink1.patch, symLink1.patch, symLink11.patch, symLink12.patch, symLink13.patch,
symLink14.patch, symLink15.txt, symLink15.txt, symlink16-common.patch, symlink16-hdfs.patch,
symlink16-mr.patch, symlink17-common.txt, symlink17-hdfs.txt, symLink4.patch, symLink5.patch,
symLink6.patch, symLink8.patch, symLink9.patch
>
>
> HDFS should support symbolic links. A symbolic link is a special type of file that contains
a reference to another file or directory in the form of an absolute or relative path and that
affects pathname resolution. Programs which read or write to files named by a symbolic link
will behave as if operating directly on the target file. However, archiving utilities can
handle symbolic links specially and manipulate them directly.

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