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https://issues.apache.org/jira/browse/PIG-2672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13670915#comment-13670915
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Aniket Mokashi commented on PIG-2672:
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For unjar behavior, I think, hadoop does not unjar if it has 
https://issues.apache.org/jira/browse/MAPREDUCE-967.
                
> Optimize the use of DistributedCache
> ------------------------------------
>
>                 Key: PIG-2672
>                 URL: https://issues.apache.org/jira/browse/PIG-2672
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Rohini Palaniswamy
>            Assignee: Rohini Palaniswamy
>
> Pig currently copies jar files to a temporary location in hdfs and then adds 
> them to DistributedCache for each job launched. This is inefficient in terms 
> of 
>    * Space - The jars are distributed to task trackers for every job taking 
> up lot of local temporary space in tasktrackers.
>    * Performance - The jar distribution impacts the job launch time.  

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