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https://issues.apache.org/jira/browse/SPARK-13902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15194946#comment-15194946
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Apache Spark commented on SPARK-13902:
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User 'ueshin' has created a pull request for this issue:
https://github.com/apache/spark/pull/11720
> Make DAGScheduler.getAncestorShuffleDependencies() return in topological
> order to ensure building ancestor stages first.
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-13902
> URL: https://issues.apache.org/jira/browse/SPARK-13902
> Project: Spark
> Issue Type: Bug
> Components: Scheduler
> Reporter: Takuya Ueshin
>
> {{DAGScheduler}} sometimes generate incorrect stage graph.
> Some stages are generated for the same shuffleId twice or more and they are
> referenced by the child stages because the building order of the graph is not
> correct.
> I added the sample RDD graph to show the illegal stage graph to
> {{DAGSchedulerSuite}} and then fixed it.
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