[jira] [Created] (SPARK-2911) provide rdd.parent[T](j) to obtain jth parent of rdd

["Erik Erlandson (JIRA)" <ji...@apache.org>]

Erik Erlandson created SPARK-2911:
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             Summary: 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


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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