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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-245) Create symbolic links in HDFS
Date Fri, 18 Sep 2009 22:08:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12757478#action_12757478
] 

Eli Collins commented on HDFS-245:
----------------------------------

Hey Konstantin,

Thanks for posting the overview. Looks good, though it's not just Doug who would prefer not
using exceptions for normal control flow. But aside from the issue of the use of exceptions
is there consensus, eg on the user-visible behavior of the latest patches? If so, sorry, wasn't
clear from the comments.

> There were no explanations on the fact of reassignment of this jira. Eli, are you committing
to support this 
> patch or do you see your mission to provide documentation and testing?

Apologies for the missing context. Dhruba hasn't had the cycles to close the jira and I offered
to help out. It wasn't clear if people were OK with the latest patches so I'll work on  working
on finishing them up so they're acceptable to people. Yes, I'm committed to supporting the
feature. 

> My personal preference is approach VI. 

Do you mean approach V? 

It seems the use of symbolic links will be a common case (eg you can imagine them being used
ala google namespaces) and therefore it would be nice to avoid multiple round trips to the
NN.

Thanks,
Eli

> Create symbolic links in HDFS
> -----------------------------
>
>                 Key: HDFS-245
>                 URL: https://issues.apache.org/jira/browse/HDFS-245
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: dhruba borthakur
>            Assignee: Eli Collins
>         Attachments: 4044_20081030spi.java, HADOOP-4044-strawman.patch, symlink-0.20.0.patch,
symLink1.patch, symLink1.patch, symLink11.patch, symLink12.patch, symLink13.patch, symLink14.patch,
symLink15.txt, symLink15.txt, 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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