[jira] [Created] (SPARK-4654) Clean up DAGScheduler's getMissingParentStages() and stageDependsOn() methods

["Josh Rosen (JIRA)" <ji...@apache.org>]

Josh Rosen created SPARK-4654:
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             Summary: 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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