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https://issues.apache.org/jira/browse/SPARK-2086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14029610#comment-14029610
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Patrick Wendell commented on SPARK-2086:
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There is an active PR for this right now:
https://github.com/apache/spark/pull/1039
> Improve output of toDebugString to make shuffle boundaries more clear
> ---------------------------------------------------------------------
>
> Key: SPARK-2086
> URL: https://issues.apache.org/jira/browse/SPARK-2086
> Project: Spark
> Issue Type: Improvement
> Reporter: Patrick Wendell
> Assignee: Gregory Owen
> Priority: Minor
>
> It would be nice if the toDebugString method of an RDD did a better job of
> explaining where shuffle boundaries occur in the lineage graph. One way to do
> this would be to only indent the tree at a shuffle boundary instead of
> indenting it for every parent.
> We can determine when a shuffle boundary occurs based on the type of
> dependency seen in the RDD.
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