[jira] Created: (HADOOP-3440) TaskRunner creates a symlink with name 'null' if a file is added to DistributedCache without fragment

[Abhijit Bagri (JIRA)]

TaskRunner creates a symlink with name 'null' if a file is added to 
DistributedCache without fragment
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                 Key: HADOOP-3440
                 URL: https://issues.apache.org/jira/browse/HADOOP-3440
             Project: Hadoop Core
          Issue Type: Bug
          Components: mapred
            Reporter: Abhijit Bagri
            Priority: Minor


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

     boolean doSymlink = getSymlink(conf);
+    if(cache.getFragment() == null) {
+      doSymlink = false;
+    }
     FileSystem fs = getFileSystem(cache, conf);




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