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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Tue, 07 Oct 2008 21:00:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637651#action_12637651
] 

Raghu Angadi commented on HADOOP-4044:
--------------------------------------

> I don't think anyone would argue that the values of isLink() and getLinkTarget()

Yes. It is of course proper data for 'stat' or FileStatus.

> But we don't want to make this many calls to our FS implementations, since they're RPCs.
So, for performance,
so.. this is a performance compromise. But the arguments till now have been about "perfect"
api/implementation for a clearly imperfect/compromise (but well performing) solution. 

> Why does this suddenly make the that same data non-normal?

in the patch it is not clalled 'nextLinkOrOpenImpl()'.. it is just called 'openImpl()'. 

> 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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