[jira] Commented: (HADOOP-2366) Space in the value for dfs.data.dir can cause great problems

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-2366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12634707#action_12634707 ] 

Tsz Wo (Nicholas), SZE commented on HADOOP-2366:
------------------------------------------------

> a directory with a whitespace name is hard to understand.

You may be right but systems like GNU/Linux support this.  For example,
{noformat}
[latest]$ mkdir " "
[latest]$ mkdir " "/foo
[latest]$ cd \ /foo/
[foo]$ pwd
/home/tsz/hadoop/latest/ /foo
{noformat}

> Space in the value for dfs.data.dir can cause great problems
> ------------------------------------------------------------
>
>                 Key: HADOOP-2366
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2366
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: conf
>    Affects Versions: 0.13.1
>            Reporter: Ted Dunning
>
> The following configuration causes problems:
> <property>
>   <name>dfs.data.dir</name>
>   <value>/mnt/hstore2/hdfs, /home/foo/dfs</value>  
>   <description>
>   Determines where on the local filesystem an DFS data node  should store its bl
> ocks.  If this is a comma-delimited  list of directories, then data will be stor
> ed in all named  directories, typically on different devices.  Directories that 
> do not exist are ignored.  
>   </description>
> </property>
> The problem is that the space after the comma causes the second directory for storage to be " /home/foo/dfs" which is in a directory named <SPACE> which contains a sub-dir named "home" in the hadoop datanodes default directory.  This will typically cause the user's home partition to fill, but will be very hard for the user to understand since a directory with a whitespace name is hard to understand.
> My proposed solution would be to trimLeft all path names from this and similar property after splitting on comma.  This still allows spaces in file and directory names but avoids this problem. 

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