[jira] [Commented] (HADOOP-7943) DFS shell get/copy gives weird errors when permissions are wrong with directories

["Ben West (Commented) (JIRA)" <ji...@apache.org>]

    [ 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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