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From "Andy Isaacson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4205) fsck fails with symlinks
Date Sat, 17 Nov 2012 02:17:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13499323#comment-13499323
] 

Andy Isaacson commented on HDFS-4205:
-------------------------------------

Attempting to delete the symlink with {{hdfs dfs -rm /foo/too.txt}} fails, but {{hdfs dfs
-rm -r /foo}} works to recover the filesystem to a {{fsck}}-able state.
                
> fsck fails with symlinks
> ------------------------
>
>                 Key: HDFS-4205
>                 URL: https://issues.apache.org/jira/browse/HDFS-4205
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 3.0.0, 2.0.2-alpha
>            Reporter: Andy Isaacson
>
> I created a symlink using
> {code}
> ...
>     FileContext fc = FileContext.getFileContext(dst.fs.getUri());
>     for (PathData src : srcs) {
>       fc.createSymlink(src.path, dst.path, false);
>     }
> {code}
> After doing this to create a symlink {{/foo/too.txt -> /foo/hello.txt}}, I tried to
{{hdfs fsck}} and got the following:
> {code}
> [adi@host01 ~]$ hdfs fsck /
> Connecting to namenode via http://host01:21070
> FSCK started by adi (auth:SIMPLE) from /172.29.122.91 for path / at Fri Nov 16 15:59:18
PST 2012
> FSCK ended at Fri Nov 16 15:59:18 PST 2012 in 3 milliseconds
> hdfs://host01:21020/foo/hello.txt
> Fsck on path '/' FAILED
> {code}
> It's very surprising that an unprivileged user can run code which so easily causes a
fundamental administration tool to fail.

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