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https://issues.apache.org/jira/browse/SPARK-4654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14228919#comment-14228919
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Apache Spark commented on SPARK-4654:
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User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/3515
> Clean up DAGScheduler's getMissingParentStages() and stageDependsOn() methods
> -----------------------------------------------------------------------------
>
> Key: SPARK-4654
> URL: https://issues.apache.org/jira/browse/SPARK-4654
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core
> Reporter: Josh Rosen
> Assignee: Josh Rosen
>
> DAGScheduler has {{getMissingParentStages()}} and {{stageDependsOn()}}
> methods, which are suspiciously similar to {{getParentStages()}}. All of
> these methods perform traversal of the RDD / Stage graph to inspect parent
> stages. We can remove both of these methods, though: the set of parent
> stages is known when a {{Stage}} instance is constructed and is already
> stored in {{Stage.parents}}, so we can just check for missing stages by
> looking for unavailable stages in {{Stage.parents}}. Similarly, we can
> determine whether one stage depends on another by searching {{Stage.parents}}
> rather than performing the entire graph traversal from scratch.
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