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https://issues.apache.org/jira/browse/PIG-240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12732148#action_12732148
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Alan Gates commented on PIG-240:
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Jeff,
It looks tome like we don't want to share LogicalPlanCloneHelper across
threads. Instead, there should be one instance per job. Otherwise separate
jobs may mingle their logical plan maps. If we instead had a shared container
that tracked LogicalPlanCloneHelper by thread id and then change LogicalPlan
and LogicalPlanCloneHelper to fetch the right map, this should work.
> 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.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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