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From "Ben West (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7943) DFS shell get/copy gives weird errors when permissions are wrong with directories
Date Thu, 02 Feb 2012 20:04:54 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13199157#comment-13199157
] 

Ben West commented on HADOOP-7943:
----------------------------------

This is turning out to be harder than I thought. The canWrite method is only valid if the
file already exists, so it's kind of useless for us.

I think the best we can do is to use the path to determine if mkdirs should do anything, and
then give the generic "couldn't create directories" error if it doesn't.

Unless someone else knows of a better method? It would be nice if there was a mkdirsAndReturnErrors
function.
                
> DFS shell get/copy gives weird errors when permissions are wrong with directories
> ---------------------------------------------------------------------------------
>
>                 Key: HADOOP-7943
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7943
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.20.205.0
>            Reporter: Ben West
>            Priority: Minor
>              Labels: hdfs, shell
>         Attachments: hadoop-7943-1.0.0.patch, hadoop-7943-1.0.0v2.patch, hadoop-7943.patch,
hadoop-7943.patch
>
>
> Let /foo be a *directory* in HDFS (issue does not occur with files) and /bar be a local
dir. Do something like:
> {code}
> $ chmod u-w /bar
> $ hadoop -get /foo/myfile /bar
> copyToLocal: Permission denied  # correctly tells me permission is denied
> $ hadoop -get /foo /bar
> copyToLocal: null           
> $ hadoop -get /foo/ /bar
> copyToLocal: No such file or directory
> {code}
> I've been banging my head for a bit trying to figure out why hadoop thinks my directory
doesn't exist, but it turns out the problem was just with my local permissions. The "Permission
denied" error would've been a lot nicer to get.

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