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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Wed, 08 Oct 2008 21:19:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638094#action_12638094
] 

Konstantin Shvachko commented on HADOOP-4044:
---------------------------------------------

Doug> Instead of direct functions that map parameters to values, we wish to implement conditional
functions, that do one of two things, and indicate in their response which path was taken.

My proposal allows to keep the code within the current API style: "direct functions that map
parameters to values".
[HADOOP-4044#action_12637702]
[HADOOP-4044#action_12637610]
[HADOOP-4044#action_12637240]

Doug> The alternative is to double or more the number of RPCs per file operation, which
is unacceptable. 

My proposal does "not double  the number of RPCs per file operation".
[HADOOP-4044#action_12637702]

So if this dispute is not about programming style, then why don't we accept the solution that
does not require any fundamental changes to the FileSystem API and does not have performance
penalties for the regular case? Or is it nevertheless about the programming style?
I keep wondering what is your selective criteria for ignoring some arguments and answering
other.


> 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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