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https://issues.apache.org/jira/browse/PIG-240?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bennie Schut updated PIG-240:
-----------------------------

    Attachment: pig-240-1.patch

I was also getting multithreading issues like "Unable to find clone for op 
Const 16-169"

the previous patch didn't help in my case (not sure why) however I changed the 
LogicalPlanCloneHelper to be used in a non-static way.
However I have to admit that I'm not 100% clear on how this 
LogicalPlanCloneHelper is working in the big picture.

This however completely solved my problem.

> Support launching concurrent Pig jobs from one VM
> -------------------------------------------------
>
>                 Key: PIG-240
>                 URL: https://issues.apache.org/jira/browse/PIG-240
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>            Reporter: Tom White
>            Assignee: Jeff Zhang
>         Attachments: patch_240.txt, pig-240-1.patch, pig-240.patch
>
>
> For some applications it would be convenient to launch concurrent Pig jobs 
> from a single VM. This is currently not possible since Pig has static mutable 
> state.

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