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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-245) Create symbolic links in HDFS
Date Mon, 28 Sep 2009 09:02:16 GMT

     [ https://issues.apache.org/jira/browse/HDFS-245?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

dhruba borthakur updated HDFS-245:

    Attachment: symlink18-common.txt

Moved the path resolving code to FileContext. Also renamed MountPointException to UnresolvedLinkException.
Please note that the signature of FileContext.getLinkTarget(Path p, UnresolvedLinkException
e) is such that the DFSClient can use the contents of the exception to resolve the link entirely
in the client-side without making another RPC to the namenode. The tradeoff is that the API
does not look elegant. Thoughts? 

> 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, 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, 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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