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https://issues.apache.org/jira/browse/HADOOP-3440?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Devaraj Das updated HADOOP-3440:
--------------------------------

      Resolution: Fixed
        Assignee: Devaraj Das
    Hadoop Flags: [Reviewed]
          Status: Resolved  (was: Patch Available)

I just committed this. Thanks, Abhijit!

> TaskRunner creates a symlink with name 'null' if a file is added to 
> DistributedCache without fragment
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3440
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3440
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Abhijit Bagri
>            Assignee: Devaraj Das
>            Priority: Minor
>             Fix For: 0.18.0
>
>         Attachments: DistributedCache.java.patch
>
>
> When adding a file to DistributedCache by  either :
> 1. DistributedCache.addCacheArchive(URI, conf) with URI not defining 
> fragment(e.g. not as new URI("path#fragment") )
> 2. DistributedCache.addCacheFile(URI, conf)  with URI not defining 
> fragment(e.g. not as new URI("path#fragment") )
> 3. DistributedCache.addArchiveToClassPath(Path, conf) 
> and one sets DistributedCache.createSymlink, TaskRunner creates a link with 
> name 'null' in the working directory. 
> I think the behavior should be that if fragment is null then no sym link 
> should be created, adding in localizeCache() of DistributedCache the following
> {code}
>      boolean doSymlink = getSymlink(conf);
> +    if(cache.getFragment() == null) {
> +      doSymlink = false;
> +    }
> FileSystem fs = getFileSystem(cache, conf);
> {code}
>      

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