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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4821) It's possible to create files with special characters in the filenames, but 'hadoop fs -ls' gives no indication
Date Tue, 14 May 2013 17:21:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13657226#comment-13657226
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Colin Patrick McCabe commented on HDFS-4821:
--------------------------------------------

This makes sense to me.  We may also want to provide a flag that causes us to output the control
characters directly, similar to ls's {{--literal}} flag.  I think most people would not choose
to use this, though.

Also note that printing control characters out directly to the console can be a security vulnerability.

http://seclists.org/fulldisclosure/2003/Feb/att-341/Termulation.txt

It should be off by default.
                
> It's possible to create files with special characters in the filenames, but 'hadoop fs
-ls' gives no indication
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-4821
>                 URL: https://issues.apache.org/jira/browse/HDFS-4821
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>            Reporter: Stephen Fritz
>
> For example:
> -bash-4.1$ hadoop fs -mkdir /user/hdfs
> -bash-4.1$ hadoop fs -touchz /user/hdfs/dupfile
> -bash-4.1$ hadoop fs -touchz /user/hdfs/dupfile^M
> -bash-4.1$ hadoop fs -ls /user/hdfs
> Found 2 items
> -rw-r--r--   3 hdfs supergroup          0 2013-05-14 07:13 /user/hdfs/dupfile
> -rw-r--r--   3 hdfs supergroup          0 2013-05-14 07:13 /user/hdfs/dupfile
> By way of comparison, bash will print a '?' at the end of the file name, indicating there's
a special character in the filename, which isn't perfect but at least gives an indication
that there's more to the filename than just alphanumeric characters

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