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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-245) Create symbolic links in HDFS
Date Mon, 01 Feb 2010 23:32:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12828332#action_12828332

Hairong Kuang commented on HDFS-245:

Eli, great work! A couple of more comments:
1. INodeSymlink extends INodeFile in your patch. Should it extend INode?
2. Should FSDirectory#mkdirs, rootDir.getExistingPathINodes(components, inodes, true) be rootDir.getExistingPathINodes(components,
inodes, false)? Mkdirs does not need to resolve the symlink of the last component.
3. Your document does not discuss the symlink resolution of concat, setQuoto, and getContentSummary
etc. Could you please add them?

> 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: Eli Collins
>         Attachments: 4044_20081030spi.java, designdocv1.txt, designdocv2.txt, designdocv3.txt,
HADOOP-4044-strawman.patch, symlink-0.20.0.patch, symlink-25-hdfs.patch, symlink-26-hdfs.patch,
symlink-26-hdfs.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,
symlink22-common.patch, symlink22-hdfs.patch, symlink23-common.patch, symlink23-hdfs.patch,
symlink24-hdfs.patch, symlink27-hdfs.patch, symlink28-hdfs.patch, symlink29-hdfs.patch, symlink29-hdfs.patch,
symlink30-hdfs.patch, symlink31-hdfs.patch, symlink33-hdfs.patch, symlink35-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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