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https://issues.apache.org/jira/browse/SPARK-2581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-2581.
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Resolution: Incomplete
> complete or withdraw visitedStages optimization in DAGScheduler’s
> stageDependsOn
> --------------------------------------------------------------------------------
>
> Key: SPARK-2581
> URL: https://issues.apache.org/jira/browse/SPARK-2581
> Project: Spark
> Issue Type: Improvement
> Components: Scheduler
> Reporter: Aaron Staple
> Priority: Minor
> Labels: bulk-closed
>
> Right now the visitedStages HashSet is populated with stages, but never
> queried to limit examination of previously visited stages. It may make sense
> to check whether a mapStage has been visited previously before visiting it
> again, as in the nearby visitedRdds check. Or it may be that the existing
> visitedRdds check sufficiently optimizes this function, and visitedStages can
> simply be removed.
> See discussion here:
> https://github.com/apache/spark/pull/1362#discussion-diff-15018046L1107
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