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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Tue, 07 Oct 2008 18:38:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637592#action_12637592
] 

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

Symlink vs link  -  I am indifferent and can go either way.


One advantage of Owen's proposal over the current patch: it will help with versioning in the
future as each method can evolve its return type 
independently of the return types of other methods. 


Dhruba> Thus, exceptions could be used here. This keeps most of the HDFS code clean and
elegant.

Doug> Yes, they could be used here, and it could be fixed later without breaking user code,
but that doesn't make it clean and elegant.
> Rather it is a quick and dirty hack. Returning normal values through exceptions is a
perversion.
> The Namenode should be revised to support links as first-class events, not as exceptions.

It is highly unlikely to  get "fixed" later and over time it will get harder and harder to
"fix".
Doug should we pay the cost and do it the "right way" now?
(BTW I prefer to use exceptions and don't agree with Doug's view;  hence my use of quotes
above).



> 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: 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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