Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/831#discussion_r12824928
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -118,8 +118,25 @@ abstract class RDD[T: ClassTag](
// Methods and fields available on all RDDs
//
=======================================================================
+ /** Accessor method which throws a runtime exception if null. This lets
us have
+ a clearer error method when attempting to perform operations on an RDD
inside of
+ a parallel operation as the partitioner is marked as transient */
+ def getPartitioner: Option[Partitioner] = {
+ partitioner match {
+ case null => throw new SparkException("Actions on RDDs inside of
another RDD operation are " +
+ "not supported")
+ case _ => partitioner
+ }
+ }
+
/** The SparkContext that created this RDD. */
- def sparkContext: SparkContext = sc
+ def sparkContext: SparkContext = {
--- End diff --
Its a NPE. Matei suggested replacing it with a less obtuse error message in
https://issues.apache.org/jira/browse/SPARK-1857 . I think this is a better
place to put the check since:
1) Other people might try and access the partitioner and then they get
sensible error messages
2) Checking for a NPE inside of the lookup() function isn't any more
intuitive
3) We already need to add a similar check to context/SparkContext here
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