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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-245) Create symbolic links in HDFS
Date Fri, 06 Nov 2009 21:52:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12774428#action_12774428
] 

Doug Cutting commented on HDFS-245:
-----------------------------------

> decided not to have a duplicate implementation for FileSystem since clients are moving
off it, reasonable? 

+1

Looking at the patch:
 - the javadoc refers to UnresolvedPathException when it should read UnresolvedLinkException,
I think.
 - under what conditions would FileContext#getFileStatus or getLinkFileStatus throw UnresolvedLinkException?
 it looks to me like this exception is always handled internally.  if a filesystem doesn't
support symlinks, or the symlink is broken, then other exceptions are thrown.  this exception
appears to be used purely for internal control purposes and shouldn't be seen by end users
so far as i can tell.  its visibility should be "limited private", i think.
 - shouldn't FilterFS#getFileLinkStatus() call getFileLinkStatus instead of getFileStatus?
 - in FSLinkResolver, what's the point of the 'catch (IOException e) { throw e; }'?



> 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: dhruba borthakur
>         Attachments: 4044_20081030spi.java, designdocv1.txt, designdocv2.txt, 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, symlink16-common.patch, symlink16-hdfs.patch,
symlink16-mr.patch, symlink17-common.txt, symlink17-hdfs.txt, symlink18-common.txt, symlink19-common-delta.patch,
symlink19-common.txt, symlink19-common.txt, symlink19-hdfs-delta.patch, symlink19-hdfs.txt,
symlink20-common.patch, symlink20-hdfs.patch, symlink21-common.patch, symlink21-hdfs.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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