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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Mon, 20 Oct 2008 22:04:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12641181#action_12641181
] 

Sanjay Radia commented on HADOOP-4044:
--------------------------------------

Doug says> Sanjay has argued that it is abnormal for a filesystem to link to a different
filesystem. This misses the intended sense of "normal". The value of a link is normal data,
under the control of the filesystem implementation, regardless of whether it points to a different
filesystem.

_Don't want to restart the debate,_ but need to correct something that was attributed to me:
I never said that symlinks to remote files were not normal. Processing them (ie following
them to a different NN) is not normal for a NN, Some NNs may follow through and some may not.
Indeed DNS does both (follows or redirects the caller).

> Create symbolic links in HDFS
> -----------------------------
>
>                 Key: HADOOP-4044
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4044
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: HADOOP-4044-strawman.patch, symLink1.patch, symLink1.patch, 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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