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https://issues.apache.org/jira/browse/SPARK-2911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14091215#comment-14091215
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Apache Spark commented on SPARK-2911:
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User 'erikerlandson' has created a pull request for this issue:
https://github.com/apache/spark/pull/1858
> provide rdd.parent[T](j) to obtain jth parent of rdd
> ----------------------------------------------------
>
> Key: SPARK-2911
> URL: https://issues.apache.org/jira/browse/SPARK-2911
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Erik Erlandson
> Priority: Minor
> Labels: easyfix, easytest
>
> For writing RDD subclasses that involve more than a single parent dependency,
> it would be convenient (and more readable) to say:
> rdd.parent[T](j)
> instead of:
> rdd.dependencies(j).rdd.asInstanceOf[RDD[T]]
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