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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Tue, 07 Oct 2008 00:17:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637318#action_12637318
] 

Doug Cutting commented on HADOOP-4044:
--------------------------------------

> BTW Do you find such use of exceptions to be acceptable inside the name node?

No.

I thought I made it clear that I had not reviewed the namenode code changes, but only those
in the public APIs.

> No one is suggesting that we handle it as a single call 

Linux's VFS does not handle both open and isLink in a single call, the way we'd like to.

> I am interpreting your reference URL link differently - I am reading it and seeing that
using exceptions for recovery is acceptable.

That's a separate issue.  Recovery from an unexpected condition out of the control of the
code in question.  That's not the case here.  Links are an expected, normal condition.


> 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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