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https://issues.apache.org/jira/browse/HDFS-245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12806530#action_12806530
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Eli Collins commented on HDFS-245:
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Thanks for the input. There's a test plan attached HDFS-254 that covers
specific cases. The ones you mentioned are covered in
TestFcHdfsSymlink#testLinkAcrossFileSystems and
FileContextSymlinkBaseTest#testRecursiveLinks. There's over 1kloc of tests
across 4 or so classes so I won't list them all. Unfortunately it's hard to do
end-to-end tests right now (eg distcp) as most of the existing tests, MR,
clients (eg FsShell) and some of the file systems implementations still use
FileSystem rather than FileContext and AbstractFileSystem. I filed HDFS-765 to
track migrating off FileSystem, so we will get additional FileContext (and the
new features it has like symlinks) coverage when we start moving more more
tests, file system implementations, and clients to FileContext and AFS.
> 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,
> 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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