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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