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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Sat, 04 Oct 2008 06:05:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636790#action_12636790
] 

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


I deal with every day and care about _both_ FileSystem and HDFS. We have two very different
approaches for the same problem in these two places (changing return types vs throwing exception)
. I does not feel quite right for me to +1 though I prefer only one of the approaches.  This
does not affect external API, but for developers internal APIs are just important. 

Two-step API is of course not good (as I pointed out in the early proposals), I don't think
it is related to 'return type' vs exception issue.

My preference is to have the same approach as in HDFS. Any API that can throw IOException,
can throw UnresolvedLinkException. Upper layers that can handle it handle it. No change return
types is required and we don't need extra classes like FSLinkBoolean, FSInputStreamLink etc.
 As minor side benifit, we also remove all the extra objects created, even when no links are
involved.

Finally, I don't think Exceptions are meant only for hard errors (FileNotFound, for e.g.).
I doubt exception is always an error, but my experience with java is less than 2 years :).

> 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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