[jira] Issue Comment Edited: (HADOOP-4044) Create symbolic links in HDFS

["Raghu Angadi (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629272#action_12629272 ] 

rangadi edited comment on HADOOP-4044 at 9/8/08 1:13 PM:
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> That imposes restriction on what SymLink can point to.
or may be not.. if an implementation (e.g. DistributedFileSystem) has all the information to instantiate another file system. 

One alternative is to have open() return {{'SymLinkFSInputStream extends FSInputStream'}} when a link is not followed by the implementation. A read on it will return bytes representinng the link (and it can have getSymLink() method).

      was (Author: rangadi):
    > That imposes restriction on what SymLink can point to.
or may be not.. if an implementation (e.g. DistributedFileSystem) has all the information to instantiate another file system. 

One alternative is to have open() return '{{ SymLinkFSInputStream extends FSInputStream }}' when a link is not followed by the implementation. A read on it will return bytes representinng the link (and it can have getSymLink() method).
  
> 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
>
>
> 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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