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https://issues.apache.org/jira/browse/PIG-1881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13012612#comment-13012612
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Laukik Chitnis commented on PIG-1881:
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Yes, that is correct. None of the two methods change the state of the original
DAG though, so I think it should be safe. Originally, it was using the clone()
method in Graph, but since we were using an unconventional method for cloning,
I opted for a new duplicate() method rather than overriding clone(). I assumed
that the old methods were removed since they were no longer used, but I would
like to know as well if there was some other reason.
> Need a special interface for Penny (Inspector Gadget)
> -----------------------------------------------------
>
> Key: PIG-1881
> URL: https://issues.apache.org/jira/browse/PIG-1881
> Project: Pig
> Issue Type: New Feature
> Components: impl
> Affects Versions: 0.9.0
> Reporter: Alan Gates
> Assignee: Laukik Chitnis
> Priority: Minor
> Fix For: 0.9.0
>
> Attachments: PIG-1881-4.patch, toolsserver.patch
>
>
> The proposed Penny tool needs access to Pig's new logical plan in order to
> inject code into the the dataflow. Once it has modified the plan it needs to
> then be able to hand back that modified plan and have Pig execute it.
> As we don't want to open this functionality up to general users, the proposal
> is to do this by subclasses PigServer with a new class that is marked as
> LimitedPrivate for Penny only. This class will provide calls to parse a Pig
> Latin script and return a logical plan, and one to take a logical plan and
> execute it.
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