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https://issues.apache.org/jira/browse/SPARK-14269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15217735#comment-15217735
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Apache Spark commented on SPARK-14269:
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User 'ueshin' has created a pull request for this issue:
https://github.com/apache/spark/pull/12060

> Eliminate unnecessary submitStage() call.
> -----------------------------------------
>
>                 Key: SPARK-14269
>                 URL: https://issues.apache.org/jira/browse/SPARK-14269
>             Project: Spark
>          Issue Type: Improvement
>          Components: Scheduler
>            Reporter: Takuya Ueshin
>
> Currently a method {{submitStage()}} for waiting stages is called on every 
> iteration of the event loop in {{DAGScheduler}} to submit all waiting stages, 
> but most of them are not necessary because they are not related to Stage 
> status.
> The case we should try to submit waiting stages is only when their parent 
> stages are successfully completed.
> This elimination can improve {{DAGScheduler}} performance.



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