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From "Daryn Sharp (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8139) Path does not allow metachars to be escaped
Date Mon, 05 Mar 2012 22:49:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222709#comment-13222709
] 

Daryn Sharp commented on HADOOP-8139:
-------------------------------------

I too had thought about {{RawLocalFileSystem}} being the place to hide the translation.  Does
windows resolve paths with forward slashes?  If not, there are interesting edge cases like
paths containing "useless" escapes.  The \ will now look like a windows directory sep so I
guess \ gets stripped and then / turned into \.  Hopefully nobody expects a path with a component
name like "foo\bar" since it works in other filesystems...

I was under the impression that hadoop in its current state didn't work on windows, although
I know an effort is underway to fix it.  If it doesn't work, could we consider punting, remove
the \ stripping, and let those leading the windows effort think about how to fix it correctly?
                
> Path does not allow metachars to be escaped
> -------------------------------------------
>
>                 Key: HADOOP-8139
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8139
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Daryn Sharp
>            Priority: Blocker
>
> Path converts "\" into "/", probably for windows support?  This means it's impossible
for the user to escape metachars in a path name.  Glob expansion can have deadly results.
> Here are the most egregious examples. A user accidentally creates a path like "/user/me/*/file".
 Now they want to remove it.
> {noformat}"hadoop fs -rmr -skipTrash '/user/me/\*'" becomes...
> "hadoop fs -rmr -skipTrash /user/me/*"{noformat}
> * User/Admin: Nuked their home directory or any given directory
> {noformat}"hadoop fs -rmr -skipTrash '\*'" becomes...
> "hadoop fs -rmr -skipTrash /*"{noformat}
> * User:  Deleted _everything_ they have access to on the cluster
> * Admin: *Nukes the entire cluster*
> Note: FsShell is shown for illustrative purposes, however the problem is in the Path
object, not FsShell.

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