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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Thu, 16 Oct 2008 21:26:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640332#action_12640332

Raghu Angadi commented on HADOOP-4044:

> The same thing that happens if that change is made just after a file is opened. If you
open a file, then someone else deletes it, subsequent accesses to that file will fail.

yes, thats an HDFS implementation problems which could be fixed. That is qualitatively different
from similar issues 'forced' by FS layer/API (which could also be fixed in future).

I don't have strong preference either way regd implementation.  

With extra RPC some of the  negatives I see (nothing too urgent): 
  - we won't see many negative affects since there are very few loads that are gated by NameNode
currently. It might change
  - Every couple of months we might need to answer "why is this so..?" question on the list
  - In my experience any extra work done that could be avoided will end up being a problem
in future. Especially  large distribute systems. So sooner or later we will end up 'correct'

> 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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