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https://issues.apache.org/jira/browse/SPARK-2911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14090397#comment-14090397
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Reynold Xin commented on SPARK-2911:
------------------------------------

Would you like to change the usage of dependencies(j).rdd.asInstanceOf[..] to 
use this new method?

> 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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