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https://issues.apache.org/jira/browse/PIG-3430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756911#comment-13756911
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Jeremy Karn commented on PIG-3430:
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1. I only added support for the mapreduce plan since that was all that we
needed. If there is demand for the other plans I can add that, although I'd
prefer to do that in a separate jira since I might not get around to it for a
couple of weeks.
2. The tmpLoader isn't strictly necessary for the xml format but its a related
code change. We use the xml output of the map reduce plan to perform
validation on input and output data locations. We wanted to be able to
differentiate between a load of user generated source data from a load of
temporary data generated from a previous job.
> Add xml format for explaining MapReduce Plan.
> ---------------------------------------------
>
> Key: PIG-3430
> URL: https://issues.apache.org/jira/browse/PIG-3430
> Project: Pig
> Issue Type: New Feature
> Reporter: Jeremy Karn
> Attachments: PIG-3430.patch
>
>
> At Mortar we needed an easy way to store/parse a script's map reduce plan.
> We added an xml output format for the MapReduce plan to make this easier. We
> also added a flag to keep track of if each store or load was from the
> original script (and associated with an alias) or if its a temporary
> store/load generated by Pig.
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