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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4044) Create symbolic links in HDFS
Date Wed, 19 Nov 2008 19:26:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur updated HADOOP-4044:
-------------------------------------

    Attachment: symLink14.patch

1. Performance testing: I have run DFSIOTest on 10 nodes only. I did not seen any performance
degradation for any operations, including creates, deletes, reads or writes. I can re-run
the test and post them here.

2. The problem is that the FileSystem.FSLinkResolver and FileSystem.resolve() will become
more complicated. Also, every operation in DFSClient will have to convert a FsResultWritbale
object into a FsResult object.

3. Fixed issues with FsResult constructor as you suggested.

4. I would like to remove the deprecated method DFSClient.getHints as part of a separate JIRA.


> 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
>             Fix For: 0.20.0
>
>         Attachments: 4044_20081030spi.java, HADOOP-4044-strawman.patch, symLink1.patch,
symLink1.patch, symLink11.patch, symLink12.patch, symLink13.patch, symLink14.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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